Jing-tai: Year 3, Month 6, Day 16
2 Jul 1452
The attendant minister Cheng Zhen and others who had been sent by Li Jun, the king of the country of Annam, presented a memorial and came to Court to offer tribute of gold and silver utensils and other local products. A banquet as well as silk clothing interwoven with gold thread, variegated silks, thin silks and paper money, as appropriate, were conferred upon them.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 33, page 4684