Cambodia becomes a French protectorate in 1863. Complete independence is granted in November 1953, with Prince Norodom Sihanouk establishing a 16-year rule. The region is soon destabilised by the war in Vietnam. Sihanouk establishes ties with North Vietnam, the Viet Cong and China and distances the country from the United States, which he believes is plotting against him. In November 1963 Sihanouk terminates an aid program run by the US and in May 1965, as the war spills into Cambodia, breaks relations completely.
Meanwhile, domestic opposition to Sihanouk starts to mount. Disaffected groups begin to go underground and take up arms, including the Khmer Rouge, the radical wing of the Kampuchean Communist Party led by Saloth Sar, later to be known to the world as Pol Pot. More background.
Born on 19 May 1925 in Prek Sbauv in Kampong Thum province, north of Phnom Penh. His father is a prosperous farmer and his family has connections to the Cambodian royal family.
1931 - At the age of six he moves to Phnom Penh to live with his brother, an official at the royal palace. He learns the rudiments of Buddhism during a brief stay at a pagoda near the royal palace before receiving his formal education at a number of French language schools and at a Catholic college, although he never obtains a high school diploma.
1946 - While serving with the anti-French resistance under Vietnam's Ho Chi Minh, he joins the outlawed Indochinese Communist Party.
1949 - Pol Pot wins a government scholarship to study radio electronics in Paris. He fails to obtain a degree but becomes enthralled by writings on Marxism and revolutionary socialism and forges bonds with other likeminded young Cambodians studying in the metropolis, including Ieng Sary, Khieu Samphan, Song Sen and the sisters Khieu Ponnary and Khieu Thirith. The members of this so-called 'Paris student group' are destined to become the leaders of the Khmer Rouge.
While in Paris Pol Pot also joins the French Communist Party and helps transform the Association of Khmer Students into a platform for nationalist and leftist ideas, openly challenging the Sihanouk government.
In a pamphlet titled 'Monarchy or Democracy' he writes, "(The monarchy) is a vile pustule living on the blood and sweat of the peasants. Only the National Assembly and democratic rights give the Cambodian people some breathing space. ... The democracy which will replace the monarchy is a matchless institution, pure as a diamond."
1951 - The Indochinese Communist Party, which is dominated by the Vietnamese, is reorganised in September into three separate units representing Vietnam, Cambodia and Laos, although the Vietnamese continue to supervise the smaller movements. The Cambodian unit is named the Kampuchean People's Revolutionary Party (KPRP).
1953 - After having his scholarship revoked Pol Pot returns to Cambodia and throws himself into work for the KPRP, first in the Kampong Cham province northwest of Phnom Penh and then in the capital itself. He also travels to the east of the country to meet with the Vietnamese communists.
He supports himself by teaching history and geography at a private school, where he is well liked and respected by his pupils.
1956 - Pol Pot marries Khieu Ponnary.
1960 - In late September Pol Pot and the 'Paris student group' take control of the KPRP, renaming it the Workers' Party of Kampuchea (WPK) and turning it away from its Vietnamese patrons. Pol Pot is elected to the number three position on the party's Central Committee, allowing him to build a strong faction.
1963 - In February Pol Pot is chosen as the WPK's general secretary, the highest position in the party, following the mysterious disappearance of the previous incumbent. In July he and most of the WPK Central Committee leave Phnom Penh to organise an insurgency base, 'Office 100', on the border with Vietnam in the country's northeast.
1965 - Pol Pot walks the recently completed 'Ho Chi Minh Trail' to Hanoi, the capital of North Vietnam, for consultations with the North Vietnamese communists, who are critical of his nationalist agenda and tell him to delay an armed struggle in Cambodia until the US is driven from Vietnam.
1966 - He receives a better reception when he makes his first visit to China, where the 'Cultural Revolution' has just been launched. He is influenced by the leading radicals supporting the movement and by Mao Tse-Tung's concept of a continuous revolution. He returns to Cambodia determined to further loosen ties with the Vietnamese communists.
The WPK changes its name again, to the Kampuchean Communist Party (KCP), though the Cambodian communists are now more commonly known as the 'Khmer Rouge'. The party's all-powerful Central Committee, headed by Pol Pot, is referred to as 'Angkar' (organisation).
1967 - Returning from a trip to North Vietnam, Pol Pot takes refuge in the northeast of Cambodia. He lives with a hill tribe and is impressed by their simple, non-material way of life, seeing it as a realisation of communist ideals.
Insurrection breaks out in the west of Cambodia at the start of the year. It is suppressed brutally but not completely and spreads. By the end of 1968 unrest is reported in 11 of the country's 18 provinces and by the end of the decade the Khmer Rouge almost completely control the mountainous regions on the border with Vietnam.
1968 - The Khmer Rouge establish the Revolutionary Army of Kampuchea in January. Aided by the US, the army launches a small and ineffectual insurgency campaign.
1969 - In March the US begins secret bombing raids on Vietnamese communist sanctuaries and supply routes inside Cambodia (dubbed the 'Menu Series'). Authorised by the newly installed US President, Richard M. Nixon, and directed by his national security adviser, Henry Kissinger, the raids are launched without the knowledge of the US Congress. Over a period of 14 months 110,000 tons of bombs are dropped. When news of the raids is leaked Kissinger orders surveillance and phone tapping of suspects to uncover the source.
US bombing raids into Cambodia continue until 1973. All told 539,129 tons of ordnance are dropped on the country, much of it in indiscriminate B-52 carpet-bombing raids. The tonnage is about three and a half times more than that (153,000 tons) dropped on Japan during the Second World War.
Thousands of Cambodians die but the raids are militarily ineffective. The Central Intelligence Agency (CIA) reports that the bombing raids are serving to increase the popularity of the Khmer Rouge among the affected Cambodian population.
1970 - Prince Sihanouk travels abroad in January to solicit Chinese and Soviet assistance to stop North Vietnam from encroaching on Cambodian territory during the course of its war with South Vietnam and the US.
On 18 March Sihanouk's right-wing opponents within the government seize the opportunity, banning his return from China and installing Defence Minister Lon Nol as premier of the newly proclaimed Khmer Republic. The coup is supported by the CIA.
The new, US-backed government stirs anti-Vietnamese sentiment and initiates ineffectual military operations against the Viet Cong troops. Simultaneously, the Lon Nol government cancels an agreement allowing North Vietnam to use the port at Sihanoukville.
In April US President Nixon authorises the invasion of Cambodia by a joint US-South Vietnamese force of 30,000 troops. Tasked with destroying Vietnamese communist bases inside Cambodia, the force pushes the Vietnamese further into Cambodia but is otherwise ineffective and is forced to withdraw in June by the US Congress.
In China, Sihanouk forms a government in exile and builds an alliance with the Khmer Rouge. Both are intent on seeing the overthrow of the Lon Nol government.
The Khmer Rouge receive military aid and training from the North Vietnamese and support from China and are quickly transformed into an effective fighting force, expanding from a small guerilla outfit of less than 5,000 to an army of 100,000 in a matter of months.
By June the Lon Nol government troops have been swept from the entire northeastern third of the country. Areas in the south and southwestern parts of the country are also overrun. By 1973 the Khmer Rouge control nearly 60% of Cambodia's territory and 25% of its population.
1973 - In an attempt to prop-up the Lon Nol government, halt the Khmer Rouge assault and destroy North Vietnamese bases in Cambodia, the Nixon administration secretly intensifies the bombing of the country, without government authorisation, and despite having signed a peace agreement with the North Vietnamese on 27 January.
1974 - In March the Khmer Rouge capture the old capital of Odongk, north of Phnom Penh. In a foretaste of what is to come, the city is destroyed, its 20,000 inhabitants are dispersed into the countryside, and teachers and public servants are executed.
1975 - Now in control of most of the Cambodian countryside, the Khmer Rouge surround and isolate the capital Phnom Penh, which has swollen with refugees fleeing the Khmer Rouge and the US bombers. The noose steadily tightens. On 17 April, Phnom Penh falls. Within days the city's entire population of over two million is marched into the countryside at gunpoint.
Pol Pot declares 'Year Zero' and directs a ruthless program to "purify" Cambodian society of capitalism, Western culture, religion and all foreign influences in favour of an isolated and totally self-sufficient Maoist agrarian state. No opposition is tolerated.
Foreigners are expelled, embassies closed, and the currency abolished. Markets, schools, newspapers, religious practices and private property are outlawed.
Members of the Lon Nol government, public servants, police, military officers, teachers, ethnic Vietnamese, Christian clergy, Muslim leaders, members of the Cham Muslim minority, members of the middle-class and the educated are identified and executed.
Towns and cities are emptied and their former inhabitants are deemed "April 17th people" or "new people." The country's entire population is forced to relocate to agricultural collectives, the so-called "killing fields." Inmates exist in primitive conditions. Families are separated. Buddhist monks are defrocked and forced into labour brigades. Former city residents are subjected to unending political indoctrination. Children are encouraged to spy on adults.
An estimated 1.5 million are worked or starved to death, die of disease or exposure, or are summarily executed for infringements of camp discipline. Infringements punishable by death include not working hard enough, complaining about living conditions, collecting or stealing food for personal consumption, wearing jewellery, engaging in sexual relations, grieving over the loss of relatives or friends and expressing religious sentiments.
Khmer Rouge records from the Tuol Sleng interrogation and detention centre in Phnom Penh (also known as S-21) show that 14,499 "antiparty elements", including men women and children, are tortured and executed from 1975 to the first six months of 1978. Only seven of those detained at the centre leave it alive.
At least 20 other similar centres operate throughout the country.
Terror and paranoia reign, reaching a climax in 1977 and 1978 when Pol Pot launches a bloody purge against the "hidden enemies, burrowing from within" and the Khmer Rouge cadres turn on themselves. At least 200,000 are executed.
1976 - The Khmer Rouge declare the new state of Democratic Kampuchea on 5 January. Prince Sihanouk resigns as head of state on 2 April and is placed under virtual house arrest in Phnom Penh. Pol Pot is made prime minister, although his identity and the identities of other members of the 'Angkar' group are kept secret from non-members. To most inside and outside of Cambodia he is a shadowy figure known as 'Brother Number One'. The subordinate leaders of the party are known as 'Brother Number Two', 'Brother Number Three', and so on.
It is not revealed that 'Angkar' is in fact the Kampuchean Communist Party until September 1977.
A four year plan is introduced that seeks to treble the country's agricultural output within a year.
1977 - Although almost the entire population is involved in agricultural production, Cambodia experiences food shortages, resulting in many more deaths. Conflicts along the Thai, Laotian and Vietnamese borders escalate. Relations with Vietnam are broken in December. At the same time, Vietnam begins to turn away from China towards the Soviet Union.
Pol Pot, meanwhile, makes a state visit to China, which promises ongoing support, including military assistance for any conflict between Cambodia and Vietnam.
1978 - Vietnam deploys division-sized units along the Cambodian border and sponsors the establishment of an anti-Pol Pot movement called the Kampuchean (or Khmer) National United Front for National Salvation.
On 25 December the Vietnamese launch a full-scale military invasion of Cambodia, rapidly pushing aside the Khmer Rouge. Phnom Penh is captured on 7 January 1979. Prince Sihanouk flees to China on the last flight out of the capital. Pol Pot and the defeated Khmer Rouge retreat to the country's remote western regions from where they wage a fitful guerilla war destined to last a further 20 years.
Between one and three million Cambodians, or about one quarter of the country's entire population of about seven million, have died during the three years, eight months and 20 days of Pol Pot's rule. On a per capita basis the Khmer Rouge "revolution" is easily the deadliest in modern Asian history.
1979 - Three days after the fall of Phnom Penh the Vietnamese occupying forces establish the People's Republic of Kampuchea (PRK), governed by the Kampuchean People's Revolutionary Party (KPRP) and headed by Heng Samrin, a former Khmer Rouge military commander. Between 125,000 and 70,000 Vietnamese troops remain in Cambodia until 1989.
Already at war with the Khmer Rouge, the PRK faces further resistance from two new insurgent movements - the noncommunist Khmer People's National Liberation Front (KPNLF) headed by Son Sen, and the National United Front for an Independent, Neutral, Peaceful, and Cooperative Cambodia (FUNCINPEC) headed by Prince Sihanouk.
In August a Phnom Penh "people's revolutionary tribunal" tries Pol Pot in absentia for genocide and sentences him to death.
In December Pol Pot is replaced as prime minister of the Khmer Rouge "government" by Khieu Samphan. Pol Pot remains as leader of the KCP and the Khmer Rouge armed forces.
1980 - The United Nations (UN) continues to recognise Pol Pot's Democratic Kampuchea as the legal representative of Cambodia. The position is backed by China, the US and ASEAN (the Association of Southeast Asian Nations), all of which are concerned by the improving relations between Vietnam and the Soviet Union and the spread of Soviet-backed communism in the region.
It is reported that the Khmer Rouge are receiving military backing from China and the US. It is also reported that a former deputy director of the CIA visits Pol Pot's operational base in November. While the UN withholds development aid from the KPRP government, the World Food Program supplies the Khmer Rouge with food worth US$12 million during 1980.
Meanwhile, Pol Pot's wife, Khieu Ponnary, goes insane. He will divorce her and in 1985 remarry a much younger second wife with who he has a daughter. Khieu Ponnary dies in 2003.
1982 - On 22 June the Khmer Rouge, KPNLF and FUNCINPEC join in a coalition (the Coalition Government of Democratic Kampuchea) against the Vietnamese. The agreement has been brokered by ASEAN. Prince Sihanouk is chosen as the coalition's president, Khieu Samphan is vice president and Son Sen is prime minister.
The coalition, which proposes a general election under UN supervision once the Vietnamese have withdrawn, is recognised by the UN as the lawful government of Cambodia. The Khmer Rouge no longer have any legal claim on the country.
1985 - Pol Pot officially resigns as commander of the Khmer Rouge military forces, although he retains a supervisory role.
1989 - The withdrawal of Vietnamese troops from Cambodia is completed in September. The PRK remains in power, headed by Hun Sen, a former member of the Khmer Rouge and later ally of the Vietnamese. The country is renamed Cambodia and the constitution amended. Renewed fighting between the PRK troops and the opposition forces, including the Khmer Rouge, breaks out on the country's western frontier with Thailand.
1991 - On 23 October the four factions (PRK, KPNLF, FUNCINPEC, Khmer Rouge) finally sign a peace treaty establishing a temporary coalition government under the supervision of a UN peacekeeping force. Prince Sihanouk returns to Cambodia and is named president.
1993 - Cambodia's first multiparty elections since 1972 are held in May, although they are boycotted by the Khmer Rouge, which claims that the Vietnamese are still covertly occupying the country. When no single party wins a majority the KPNLF and FUNCINPEC form a coalition with two smaller groups.
However, Hun Sen refuses to give up control of the government, leading to a power-sharing arrangement between the coalition and the PRK.
Pol Pot goes into hiding and continues the insurgency against the government. He is reported to be in command of a shrinking and demoralised Khmer Rouge guerrilla force based in the Phnum Dangrek Range near the northern border with Thailand. Funding for the movement is obtained through the sale of gem mining and logging concessions to Thai interests, with the revenue estimated to be worth about US$200 million a year.
1996 - The Khmer Rouge begin to split. In August Ieng Sary, Khmer Rouge foreign minister and 'Brother Number Three', defects to the Cambodian armed forces, bringing about 4,000 guerrillas with him. Ieng Sary subsequently names Pol Pot as the "sole and supreme architect" of the Khmer Rouge's "line, strategy and tactics." It is the beginning of the end for the Khmer Rouge, who are now reduced to just a few thousand cadres.
1997 - In June Pol Pot becomes convinced that Son Sen, the Khmer Rouge minister for defence and his friend for 40 years, is collaborating with the Cambodian Government and orders his execution. Sen's wife and children are also killed.
Pol Pot is subsequently arrested by Ta Mok, the Khmer Rouge military commander and 'Brother Number Five'. On 25 July a "peoples' tribunal" sentences Pol Pot to life imprisonment for Sen's murder. Pol Pot is reported to be ailing and near death.
During the trial Pol Pot agrees to an interview with Nate Thayer, a journalist with the 'Far Eastern Economic Review'.
"First, I want to let you know that I came to join the revolution, not to kill the Cambodian people," Pol Pot tells Thayer.
"Look at me now. Do you think ... am I a violent person? No. So, as far as my conscience and my mission were concerned, there was no problem. This needs to be clarified. ...
"My experience was the same as that of my movement. We were new and inexperienced and events kept occurring one after the other which we had to deal with. In doing that, we made mistakes as I told you. I admit it now and I admitted it in the notes I have written.
"Whoever wishes to blame or attack me is entitled to do so. I regret I didn't have enough experience to totally control the movement. On the other hand, with our constant struggle, this had to be done together with others in the communist world to stop Kampuchea becoming Vietnamese.
"For the love of the nation and the people it was the right thing to do but in the course of our actions we made mistakes."
Meanwhile, Hun Sen and the PRK seize full control of the Cambodian Government in July, using force of arms to oust the coalition in an action that amounts to a military coup.
1998 - Pol Pot dies in the evening of 15 April, reportedly from heart failure, although the cause of his death remains unclear. Hours earlier he had learned from a radio broadcast that Ta Mok was willing to hand him over to the government for trial. His body is cremated on a pyre of old car tyres beside a village latrine. The site is later enclosed by a crude timber shelter roofed with old sheets of corrugated iron.
In May Cambodian armed forces capture the last stronghold of the Khmer Rouge in the country.
1999 - In February the last remaining members of the Khmer Rouge are incorporated into the Cambodian armed forces. In March Ta Mok, the last Khmer Rouge leader at large, is arrested.
2001 - A report released by the Documentation Centre of Cambodia in July accuses seven former Khmer Rouge leaders of direct participation in the atrocities of the Pol Pot regime and verifies the existence of "a policy of mass murder devised at the highest levels of power and implemented through a coordinated chain of command."
The Documentation Centre is a private organisation set up to collect Khmer Rouge records as a historical resource for the public and as potential evidence in any future trials. It originated in the Cambodian Genocide Program at Yale University in 1995 with a grant from the US Department of State.
The discoveries by the centre cause experts to revise upward the estimated number of victims of the Khmer Rouge from 1.7 million to 2.2-2.5 million.
In August 2001 the Cambodian Government passes legislation to set up a joint tribunal of local and international judges and prosecutors to try former leaders of the Khmer Rouge for genocide.
Only two former Khmer Rouge are being held in detention awaiting trial for genocide, crimes against humanity and war crimes - Ta Mok, the military commander who arrested Pol Pot in 1997, and Kaing Khek Iev, the governor of the Tuol Sleng detention centre.
Most of the senior leaders of the Khmer Rouge remain free, including Nuon Chea, one of the members of the 'Paris student group'. Nuon Chea was 'Brother Number Two' in the Khmer Rouge hierarchy, and a hard-line and unrepentant supporter of Pol Pot.
2003 - On 30 December, Khieu Samphan becomes the first of the former Khmer Rouge leaders to acknowledge that their regime committed genocide. "There's no more doubt left," he says.
Meanwhile, the Cambodian Government unveils a multi-million dollar plan to turn Pol Pot's cremation site and its surrounds into an official "historical tourism" zone. Under the plan, dilapidated Khmer Rouge buildings at the site will be renovated and a new access road constructed from Angkor, about 120 kilometres to the south. The project features a purpose-built memorial, museum and theatre complex to chronicle the genocide of the Khmer Rouge regime.
2004 - In January Nuon Chea announces that he is willing to face an international genocide tribunal in order to set the record straight.
"I admit that there was a mistake," Nuon Chea says, "But I had my ideology. I wanted to free my country. I wanted people to have wellbeing."
According to Nuon Chea, his key error was to not check up carefully on the work of the regime. "People died, but there were many causes of their deaths," he says, denying that millions perished.
On 4 October the Cambodian National Assembly unanimously ratifies an agreement with the UN to set up a genocide tribunal. The Cambodian Senate also approves the agreement. Although no timetable is set for the commencement of proceedings, the tribunal is expected to run for three years and cost US$57 million. It will be known as the Extraordinary Chambers in the Courts of Cambodia.
2006 - Ta Mok, one of the two the senior Khmer Rouge cadres being held in custody on charges of genocide, dies on 21 July.
2007 - On 19 July prosecutors for the genocide tribunal submit a list of five former Khmer Rouge leaders who they believe should stand trial.
Noun Chea is arrested on 19 September. He is charged with crimes against humanity and war crimes, including "murder, torture, imprisonment, persecution, extermination, deportation, forcible transfer, enslavement and other inhumane acts."
Ieng Sary and his wife, Khieu Thirith, are arrested on 12 November. Both are charged with crimes against humanity. Ieng Sary is also charged with war crimes.
Khieu Samphan is arrested on 19 November and charged with crimes against humanity and war crimes.
The tribunal gets underway the following day when a court is convened for a pretrial hearing of a bail application by Kaing Khek Iev. The application is denied.
Kaing Khek Iev is formally charged with crimes against humanity and war crimes on 12 August.
2008 - On 11 February 'The Independent' newspaper publishes an exclusive interview with Kaing Khek Iev.
"I and everyone else who worked in that place (Tuol Sleng) knew that anyone who entered had to be psychologically demolished, eliminated by steady work, given no way out," Kaing Khek Iev tells reporter Valerio Pellizzari.
"No answer could avoid death. Nobody who came to us had any chance of saving himself. ...
"It was Ta Mok who had ordered all the prisoners to be eliminated. We saw enemies, enemies, enemies everywhere. ...
"I was cornered, like everyone in that machine, I had no alternative. Pol Pot, the No. 1 Brother, said you always had to be suspicious, to fear something. And thus the usual request came: interrogate them again, interrogate them better.
"If I had tried to flee, they were holding my family hostage, and my family would have suffered the same fate as the other prisoners in Tuol Sleng. If I had fled or rebelled it would not have helped anyone."
2009 - Kaing Khek Iev's trial begins on 17 February with an opening procedural session. When the trial resumes on 30 March Kaing accepts responsibility for his crimes.
"I recognise that I am responsible for the crimes committed," he says. "I would like to express my regretful and heartfelt sorrow."
In a later session, Kaing blames the policies of the Nixon administration for the rise of the Khmer Rouge. "I think the Khmer Rouge would already have been demolished" by 1970, he says.
"But Mr Kissinger and Richard Nixon were quick (to back coup leader Lon Nol), and then the Khmer Rouge noted the golden opportunity. ...
"Prince Sihanouk called on the Cambodian people to go and join the communist Khmer Rouge in the jungle and that allowed the Khmer Rouge to build up their troops from 1970 to 1975."
Talking about the establishment of Tuol Sleng, Kaing says, "Pol Pot was the one who initiated the idea, Son Sen implemented it and Nuon Chea is the one who did the follow up. This is from my observation and from the surviving documents. ...
"The principle was that whoever was arrested and interrogated had to be smashed. That meant be killed. ...
"Everyone who was arrested and sent to S-21 (Tuol Sleng) was presumed dead already. ...
"No one was entitled to release them. Even Pol Pot, the most senior person in the Khmer Rouge, acknowledged that he had no right to release any people. That was the party line. ...
"Pol Pot was a murderer. He was the greatest criminal father of Cambodia. ... I did not think of Pol Pot as a patriot, he had blood on his hands."
Kaing Khek Iev's trial concludes at the end of November. On 26 July 2010 he is found guilty as charged and sentenced to 35 years jail. Following an appeal, the sentence is increased to life.
Meanwhile, the charges against Nuon Chea, Khieu Samphan, Ieng Sary and Khieu Thirith are expanded to include genocide. The four are formally indicted on 16 September 2010. All claim to be innocent.
Charges against the defendants are split into two parts to expedite a verdict. The first part of the trial will focus on the forced evacuation of people to labour camps in the countryside and one mass execution. The second part is concerned with charges of genocide committed against Muslims and ethnic Vietnamese minorities, the use of slave labour in work camps, mass executions, forced marriages and rape.
2011 - In November, Khieu Thirith is found to be suffering from dementia. She is declared unfit to stand trial but remains in custody. Opening statements in the first part of the trial of the remaining three defendants begin on 21 November.
"The accused cannot credibly claim they did not know and had no control over the crimes that occurred," says prosecutor Andrew Cayley. "These crimes were the result of an organised plan developed by the accused and other leaders. ... They cannot be blamed solely on Pol Pot as some of the accused may try."
Speaking in rebuttal, Noun Chea says the Khmer Rouge acted to save Cambodia from an invasion by Vietnam. "The Vietnam factor is the main factor that caused confusion in Democratic Kampuchea from 1975 to 1979," he says.
"(After the end of the Vietnam war) Vietnam's cadres still continued to remain discreetly on Cambodian soil in order to conquer this country in accordance with the ambition to occupy, annex and swallow Cambodia and rid Cambodia of her race and ethnicity."
"We wanted to free Cambodia from being a servant of other countries, and we wanted to build Cambodia as a society that is clean and independent, without any killing of people or genocide," he says.
Khieu Samphan says that US bombing of Cambodia led to the rise of the Khmer Rouge. "You seem to forget that between January 1970 and August 1973 - that is, the period of two and a half years - the United States carpeted the small Kampuchean territory with bombs," he says.
"Could you imagine what my country faced after such a bloody killing and war? Can you imagine what the situation was like for the Cambodian people and the country as a whole during such carpet bombings?"
When questioning of the defendants begins at the start of December, Noun Chea continues to blame Vietnam for the atrocities committed during the Khmer Rouge period. "These war crimes and crimes against humanity were not committed by the Cambodian people," he says. "It was the Vietnamese who killed Cambodians."
2012 - Khieu Thirith, who had been found unfit to stand trial due to dementia, is set free on 16 September.
2013 - Ieng Sary dies on 14 March.
At the end of May, Noun Chea tells the court he takes "responsibility morally" for what occurred under the Khmer Rouge. ''I feel remorseful for the crimes that were committed intentionally or unintentionally and whether or not I had known about it or not known about it," he says.
Khieu Samphan says he regrets the "unspeakable suffering" inflicted upon the Cambodian people by the Khmer Rouge but maintains he "cannot bear responsibility for those actions."
When the first part of the trial concludes in October both Noun Chea and Khieu Samphan deny all the charges brought against them. The verdict is handed down on 7 August 2014. Noun Chea and Khieu Samphan are found guilty of crimes against humanity and sentenced to life in prison.
2015 - The second part of the trial of Noun Chea and Khieu Samphan begins hearing evidence on 8 January. The trial is expected to last until 2017.
Khieu Thirith dies on 22 August.
Prince Norodom Sihanouk has summed up the character of one of the worst genocidal dictators of the 20th Century, saying, "Pol Pot is very charming. ... His face, his behaviour is very polite, but he is very, very cruel."
Others who knew him have elaborated on this description, calling Pol Pot calm, cold-blooded, extremely secretive, and above all paranoid - traits that allowed him to oversee the genocide of hundreds of thousands of innocent men, women and children.
The last word here goes again to Sihanouk.
"Pol Pot does not believe in God but he thinks that heaven, destiny, wants him to guide Cambodia in the way he thinks it the best for Cambodia, that is to say, the worst. Pol Pot is mad, you know, like Hitler."