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 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)