When he became the Azukari dokoro of Kanzaki no sho (imperial estate) in the Hizen Province, he eliminated the influence of Dazaifu (the governmental office with jurisdiction over Kyushu, Iki and Tsushima under the ritsuryo system) and became directly involved in trade between Japan and Song.
肥前国神崎荘の預所となった忠盛は、大宰府の関与を排除して日宋貿易にも直接介入するようになった。