《北齐书·列传·卷十九》
贺拔允熟练弯弓骑马，为人有胆略，和弟弟贺拔岳一起杀死了强盗头子卫可肱，然后投奔北魏。
允便弓马，颇有胆略，与弟岳杀贼帅卫可肱，仍奔魏。
He Bayun was skilled in archery and horse-riding and had courage. He and his younger brother He Bayue killed the bandit leader Wei Kegong and then joined Northern Wei.