was a samurai member of the Minamoto clan, who was the founder of Izumo-Genji clan.
Background
Sasaki Yoshikiyo was born the fifth son of Sasaki Hideyoshi, who was the head of the Sasaki clan of Uda-Genji (Uda-Gen clan), based in Sasaki-no-sho, Gamo-gun Manor in Ōmi Province. His father Hideyoshi Sasaki fought against the Taira clan in the Hōgen (1156) and Heiji Wars (1160). Following his defeat in 1160, Hideyoshi was deprived of his feudal estate, and moved away to Sagami Province. Shibuya Shigekuni respected Hideyoshi's bravery and sheltered Hideyoshi in his territory and had his daughter marry Hideyoshi.
Sasaki Yoshikiyo was born in Sagami in 1161 as the fifth son of Sasaki Hideyoshi. His mother was a daughter of Shibuya Shigekuni. Although Yoshikiyo had four elder brothers, they were by different mothers. Yoshikiyo grew up in Sagami, and married a daughter of Ōba Kagechika.
