《元史·本纪·卷十》
派遣礼部尚书柴椿等出使安南国，下诏严厉谴责安南国王并命其前来朝见。
遣礼部尚书柴椿等使安南国，诏切责之，仍俾其来朝。
Chai Chun, the Minister of Rites, was sent as an envoy to the Kingdom of Annam, and an imperial edict was issued to severely reprimand the King of Annam and order him to come and pay homage.