1.
Yan, a vassal state of Zhou in modern Hebei and Liaoning
2.
north Hebei
3.
the four Yan kingdoms of the Sixteen Kingdoms, namely: Former Yan qiányān前燕 (337-370), Later Yan hòuyān後燕hòuyān后燕 (384-409), Southern Yan nányān南燕 (398-410), Northern Yan běiyān北燕 (409-436)