薩摩国
Ata Tadakage was succeeded by Ata Nobusumi, who married Tadakage's daughter. Nobusumi survived Taira no Kiyomori's dominion. Kiyomori controlled the Shimazu Estate, which covered a large portion of Satsuma Province, while he appointed his younger brother Tadanori Governor of Satsuma Province. It is likely that the Taira clan's domination of southern Kyūshū was aimed at controlling Japan's trade with Song China. After the Genpei War, the newly established Kamakura shogunate seized Ata Nobusumi's territories in 1192 for his affiliation with the Taira clan and gave Ata District to Samejima Muneie. However, Tadakage's relatives continued to prosper as Samejima Muneie married a daughter of Tadakage's younger brother and adopted son Tadayoshi.