Ijūin Tadakuni

Ijūin Tadakuni (fl. 1337–1351), son of Tadachika, was a Satsuma warrior and fifth head of the Ijūin clan, a Shimazu branch. He at first served the Northern Court with Shimazu Sadahisa, but in 1337, after a Southern Court envoy reached Satsuma, he alone of the Shimazu kindred rose for the South at Ichiuji Castle.

For years he warred with the main Shimazu house across Satsuma and Ōsumi, taking Matsuo Castle in Kōriyama in 1350. Later reconciling with the clan, he married his daughter to Shimazu Ujihisa.