凯山·丰威汉
Nicknamed "The Red Prince", he became part of the Lao People's Revolutionary Party. Upon its successful seizure of power in 1975, he became the first President of the Lao People's Democratic Republic, a position which he held until 1991. After 1986, Phoumi Vongvichit acted in his stead as president, though Souphanouvong still technically remained President. Kaysone Phomvihane succeeded him as president in 1991. He was the President of the Supreme People's Assembly from 1975 to 1988.