For the first time, two leaders of the brutal Khmer Rouge regime in Cambodia have been found guilty of genocide.
Nuon Chea (NOO'-ahn CHEE'-ah) and Khieu Samphan (KEE'-yoh sahm-PAHN') were sentenced by the United Nations -assisted court to life in prison, the same punishment they are already serving after being convicted in a previous trial for crimes against humanity connected with forced transfers of people and mass disappearances.
Although the widespread slaughter that rent Cambodia between 1975 and 1979 is often called a "genocide" - known as the "crime of all crimes" - the loaded charge carries a narrow legal definition.
Although Cham Muslims and ethnic Vietnamese died in large numbers, the UN Convention on Genocide speaks of "intent to destroy, in whole or in part, a national, ethnic, racial or religious group".
With the pair already serving life sentences from a previous trial, and no death penalty in Cambodia, the tribunal's sentences (further life sentences) were more symbolic.
But the landmark moment came when Nuon Chea was found guilty of genocide for the attempt to wipe out Cham Muslims and ethnic Vietnamese Cambodians, and Khieu Samphan was found guilty of genocide against the ethnic Vietnamese.
The court found Khieu Samphan not guilty of genocide against the Cham, for lack of evidence, though he was found guilty of genocide against the Vietnamese under the principle of joint command responsibility.
The following year on August 8, 2014, the two are found "guilty of crimes against humanity or extermination. political persecution and other inhumane acts" and jailed for life - a sentence that causes survivors to burst into applause as they weep after a 35-year wait for justice.
Eav was the commandant of the notorious Tuol Sleng S-21 prison, where more than 14,000 people died.
But executions counted for only a fraction of the death toll.
Watch: Cambodian PM leads rally on anniversary of Khmer Rouge's fall. They immediately attempted a radical transformation of Cambodia into a peasant society, emptying cities and forcing the population to work the land.
Ronald Keith Dean, who with his friend David Scott was captured by the Khmer Rouge and killed in 1978 after their yacht wandered into Cambodian waters.
But many Cambodians pay little attention to the tribunal, and young people in particular are keen for their country to be known for something other than the "Killing Fields". The regime was ultimately toppled by a 1979 Vietnamese invasion.
More than 1.7 million Cambodians, nearly a quarter of the population, were murdered between 1975 and 1979, as Pol Pot, known as "Brother Number 1", attempted to forcibly transform the nation into a socialist agrarian republic. Pol Pot and some of his forces were forced to retreat into the jungle, where the former dictator died in 1998.
Prime Minister Hun Sen - himself a former Khmer Rouge cadre - has repeatedly warned he would not allow more investigations to proceed, citing vague threats to stability.
The Extraordinary Chambers in the Courts of Cambodia, established in 2006, has so far only convicted three people for the regime's atrocities.
Jack Phillips and Kelly Ni of The Epoch Times, and the Associated Press contributed to this article.