日向國
Around the Hōen era (1135–1141), Tanegashima became part of Shimazu Estate on southern Kyūshū. The Shimazu Estate was said to have established at Shimazu, Hyūga Province in 1020s and dedicated to "Kanpaku" Fujiwara no Yorimichi. In the 12th century, Shimazu Estate expanded to a large portion of the Satsuma and Ōsumi Provinces including Tanegashima.