Samukawa no Ama

Samukawa no Ama (1138–1228) was a daughter of Hatta Munetsuna and a wet nurse of Minamoto no Yoritomo. She became the second wife of the Shimotsuke warrior chieftain Oyama Masamitsu and the mother of Yūki Tomomitsu.

In 1180 she brought her fourteen-year-old son to Yoritomo's camp at Sumida; Yoritomo personally presided over his coming-of-age, and the Oyama warrior band joined the rising. In 1187 Yoritomo made her land steward of Samukawa District in Shimotsuke.