Furthermore, as the aristocratic society was restructured during the cloistered government, promotion path to official positions and the final achievable position/rank became determined more by birth, and the aristocratic clans from the ancient times differentiated into each mon and transformed into the "Ie (family, house)" of the middle ages.
更に院政期において公家社会が再編される中で官職昇進次第や極位極官が出自によって決定される傾向が強まっていくと、古代からの貴族諸氏は一門に分化して中世的な「家」へと変質していく。