There were some documents showing that he had worked very well as Gokenin in Kyoto since about 1200, serving as Tsuibu (officer of Police and Judicial Chief) and corresponding secretary between imperial court and the bakufu.
京都では、正治2年（1200年）頃から御家人としての活躍が記録され、盗賊との追捕や幕府との連絡係を務めた。