《魏书·列传·卷三十六》
北虏旧隶，禀政在蕃，往因时囗，逃命北辕。
北虏旧隶，禀政在番，往因时囗，逃命北辕。
The northern barbarians were formerly vassals, and they held office in the vassal states. In the past, they took advantage of the situation and fled to the northern grasslands to save their lives.