was a daimyo (feudal lord) of Satsuma Province during Japan's Sengoku period. He was born to a branch family of the Shimazu clan, the Mimasaka Shimazu family (伊作島津家) but after his father Shimazu Yoshihisa died, his mother married Shimazu Unkyu of another branch family, the Soshū(相州家). Tadayoshi thus came to represent two families within the larger Shimazu clan. Tadayoshi wrote an Iroha poem that sung of the importance of unity and also to give more literacy to his men. It begins with following words: