 Expanded substantially in the first half of the 12th century, it eventually covered large portions of Satsuma, Ōsumi and Hyūga Provinces.In 1185, Koremune no Tadahisa was appointed as "jitō" of the Shimazu Estate and thereafter claimed the clan name of Shimazu.It is said that one of Tadahisa's residences, called Iwayoshi Gosho, was located at Miyakonojō.