Ōsumi Province
The Shimazu Estate originally covered Shimazu, Morokata District of southern Hyūga Province (modern-day Miyakonojō, Miyazaki Prefecture) but was soon expanded into the neighboring lands of the province. Under the patronage of the powerful Fujiwara clan, Taira no Suemoto exercised effective administrative control over the lands. In 1029, Taira no Suemoto even raided the government office of the neighboring Ōsumi Province but a fragmentary sources suggest that he was not punished severely.