Aisu

The Aisu were a maritime warrior family based at Gokasho Castle on the coast of Ise Province, under Kitabatake influence.

From 1451 they participated in the Muromachi shogunate's Ming trade. Aisu Hisatada travelled to Beijing with a mission that left Sakai in 1483; known as Ikōsai, he founded the Kage school of swordsmanship. After the Kitabatake fell, the Aisu served the Satake, adopted the name Hirasawa and followed them to Dewa after the Battle of Sekigahara in 1600.