He was also on a list of most-wanted men, and the United States government would have paid a hefty reward for his capture.
When he appeared before the court in 2013 for the first time and the judge asked him to state his profession, Mr. Ntaganda replied simply, “I was a soldier in the Congo.” He also told the judge and a room full of black-gowned lawyers, “I was informed of these crimes, but I plead not guilty.”
He testified for weeks in his own defense, saying he wanted to put the record straight about his reputation as a ruthless military leader, but was unable to convince the three-judge panel of his innocence.
The judges said he was guilty as a direct perpetrator or co-perpetrator of a string of crimes including murders, rapes of men and women, a massacre in a banana field behind a building called the Paradiso and of enlisting and using child soldiers. Child soldiers were raped by his troops and forced into sexual slavery, leaving them with lasting physical and psychological scars. Mr. Ntaganda himself used child soldiers as bodyguards.
The verdict, against a man whose power once made him seem invulnerable, sent a strong warning to other abusive commanders, analysts said at the time.
“When warlords see these convictions, they know they can be prosecuted,” said Kathryn Sikkink, a professor of human rights policy at the Harvard Kennedy School.
The leader of the Patriotic Forces for the Liberation of Congo, Thomas Lubanga, was also convicted by the same court in 2012 of using child soldiers. He is serving a 14-year prison sentence. Mr. Ntaganda was given a harsher sentence because he was convicted of far more crimes.