Ijūin

The Ijuin of Satsuma were a Shimazu branch, claiming Ki descent but founded when Toshitada of the Shimazu received the stewardship of Ijuin in Hioki district; his son Hisakane first used the Ijuin name. In the Nanboku-cho wars the fifth head Tadakuni left the Northern Court for the Southern Court and gathered the Shibuya and Hishikari to fight the Shimazu main house.

The sixth head Hisauji helped defeat the Kyushu deputy Imagawa Ryoshun. Later, Hirohisa killed Machida Takahisa at Ichiuji castle, bringing a Shimazu siege and exile to Higo. The junior line's Tadamune became chief councillor of Shimazu Yoshihisa.

After the Shimazu submitted to Toyotomi Hideyoshi, Tadamune won an eighty-thousand-koku fief at Miyakonojo but was killed by Shimazu Tadatsune. His son Tadazane rose in 1599 in the Sho-nai revolt and was destroyed with his family; other Ijuin lines continued as Satsuma samurai.