《北史·列传·卷六十二》
炀帝指责张衡身为宪司而不能加以匡正，将张衡贬出京城任榆林太守。
帝谴衡以宪司皆不能举正，出为榆林太守。
Emperor Yang accused Zhang Heng of being unable to rectify as a constitutional department and demoted him out of the capital as the prefect of Yulin.