Isshiki

The Isshiki were a warrior house of the Seiwa-Genji and a branch of the Ashikaga clan. Their founder Isshiki Kōshin, a son of Ashikaga Yasuuji, took the family name from Isshiki in the Kira manor of Mikawa Province, where the clan held its domain from the late thirteenth century.

In 1336 Isshiki Yoriyuki followed Ashikaga Takauji to Kyushu, falling the next year at the Battle of Inuzukahara against the Southern Court. Under the Muromachi shogunate the Isshiki became the foremost of the four shiki houses eligible to head the Samurai-dokoro, and inherited the military governorships of Wakasa, Mikawa and Tango.

They survived into the Sengoku period as daimyō of Tango, but the invasions of Hosokawa Fujitaka and his son Tadaoki in the 1570s and early 1580s overran the province and ended the main line's rule.