TAIRA no Tadamori, who was also Echizen no kami (Governor of Echizen Province), aiming at the trade between Japan and China, governed Kanzaki no sho (imperial estate) in Hizen Province which was goinryo (lands attached to the place of a retired emperor), and did his own trade.
越前守でもあった平忠盛は日宋貿易に着目し、後院領である肥前国神崎荘を知行して独自に交易を行った。