Tadatsune owned a large territory in Kazusa Province, Shimousa Province and Hitachi Province, behaved outrageously and did not obey orders of the Kokushi (provincial governor) nor fulfill his obligations to pay taxes.
忠常は上総国、下総国、常陸国に父祖以来の広大な所領を有し、傍若無人に振る舞い、国司の命に服さず納税の義務も果たさなかった。