refers to the letter from capital 郢[Yǐng] of 楚[Chǔ] in which the inadvertent words "hold up the candle" are mistaken by the minister of 燕[Yān] as "promote the wise"
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 (337-370), Later Yan 後燕|后燕 (384-409), Southern Yan 南燕 (398-410), Northern Yan 北燕 (409-436)
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 (337-370), Later Yan 後燕|后燕 (384-409), Southern Yan 南燕 (398-410), Northern Yan 北燕 (409-436)