Большой китайско-русский словарь
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Yan, a vassal state of Zhou in modern Hebei and Liaoning
north Hebei
the four Yan kingdoms of the Sixteen Kingdoms, namely: Former Yan 前燕 (337-370), Later Yan 后燕 (384-409), Southern Yan 南燕 (398-410), Northern Yan 北燕 (409-436)