[1] Ata Tadakage's rise to power was seen as a rebellion by the central government, which was then controlled by Taira no Kiyomori.
Due to high waves and strong winds, Iesada was unable to track Tadakage down, and he disappeared from history.
[1] Ata Tadakage drew attention from historians and archaeologists in the 1990s when the Mottaimatsu Site was excavated.
The archaeological site is located on the northern bank of the Manose River, which served as Ata District's southern border.
It is considered to have served as a trade center connected to Hakata–Dazaifu of northern Kyūshū and to the Southern Islands since it had a huge variety of goods including Kamuiyaki, a large number of Chinese ceramics such as Longquan celadon and Tong'an celadon, and in smaller quantity, sue ware from eastern Harima Province, and Tokoname-yaki from Owari Province.
It is likely that the Taira clan's domination of southern Kyūshū was aimed at controlling Japan's trade with Song China.
[3] In 1187, the future first shōgun Minamoto no Yoritomo dispatched Amano Tōkage and Utsunomiya Nobufusa to drive enemies out from Kikai-ga-shima.