Yan, a vassal state of Zhou in present-day Hebei and Liaoning
north Hebei
the four Yan kingdoms of the Sixteen Kingdoms, namely: Former Yan 前燕QiánYān (337–370), Later Yan 后燕HòuYān (384–409), Southern Yan 南燕NánYān (398–410), Northern Yan 北燕BěiYān (409–436)