TAIRA no Tadamori, who was confided in by Emperor Toba, began the trade between Japan and Sung Dynasty in China through chigyo (enfeoffment) of Kanzaki-no-sho in Bizen Province, which was Goin Palace's manor (territory of Emperor's retreat), and came to be admitted as In no Kinshin (the retired Emperor's courtier) by presenting imported goods.
鳥羽天皇の信任の厚かった平忠盛は、後院領荘園（天皇の隠居所の所領）であった肥前国神埼荘の知行を通じて日宋貿易を開始し、舶来品を院に進呈して院の近臣としてみとめられるようになった。