《北史·列传·卷九》
明元帝因为各郡国中的豪门士族头领有害于地方和国家，便下优诏征召他们到京城。
明元以郡国豪右大人蠹害，乃优诏征之。
Because the leaders of the wealthy and powerful families in various counties and states were harmful to the locality and the country, Emperor Mingyuan issued an edict summoning them to the capital.