《北史·列传·卷三十六》
孝昌末年，尔朱荣占据并州、肆州，任天光为都将，总统肆州的兵马。
孝昌末，荣据并、肆，仍以天光为都将，总统肆州兵马。
By the end of Xiaozhang Emperor's reign, Erzhu Rong occupied Bingzhou and Sizhou and appointed Tianguang as the Chief General, commanding the troops in Sizhou.