Two members of the group, Khieu Samphan and Hou Yuon, earned doctorates from the University of Paris while Hu Nim obtained his degree from the University of Phnom Penh in 1965. Most came from landowner or civil servant families. Pol Pot and Hou Yuon may have been related to the royal family as an older sister of Pol Pot had been a concubine at the court of King Monivong. Pol Pot and Ieng Sary married Khieu Ponnary and Khieu Thirith, also known as Ieng Thirith, purportedly relatives of Khieu Samphan. These two well-educated women also played a central role in the regime of Democratic Kampuchea.