Ōida

The Ōida were an Echigo branch of the Satomi clan, a Nitta house of Minamoto descent. Satomi Yoshinari's descendants held the Ōida estate in Uonuma district and took its name.

As leaders of the Echigo Nitta league they answered Nitta Yoshisada's rising. Ōida Tsunetaka brought two thousand horsemen to the army that took Kamakura, while his son Ujitsune raised twenty thousand men to relieve Yoshisada after the defeat at Minatogawa, until news of Yoshisada's death in 1338 dissolved the force.

An Ashikaga army then stormed Ōida Castle, and the house sank to small local landholders. In the Sengoku age it served the Ueda Nagao and then Uesugi Kagekatsu, whose childhood guardian came from the family. In 1590 Kagekatsu ordered its head Kagekuni to disembowel himself. The main line ended, the name passing to a kinsman who served the Yonezawa domain.