Ōba

The Ōba were a warrior family of the Ōba estate in Sagami Province. Their power in Kantō declined, and in 1213 Ōba Kagetsura built a castle in Bingo Province.

During the Sengoku period, generally dated from the late fifteenth century, the Koshi, retainers of the Amago, reportedly captured the castle in Bingo. Other members served the Ōuchi and Mōri, and descendants continued as retainers of Chōshū.