1.
Yan, a vassal state of Zhou in present-day 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)