Yong-le: Year 12, Month 3, Day 11
1 Apr 1414
The Chief Steward Zhu Yuan and others were sent as envoys to the country of Cambodia. Previously, the persons sent by Cambodia to offer tribute had said that their country had been repeatedly attacked by Champa. The envoys then long remained in the capital. At this time, the Emperor sent Yuan and others to escort the envoys home and to confer variegated silks upon Can-lie Zhao Ping-ya, the king of the country of Cambodia. Separate orders of warning were sent to Zhan-ba Di-lai, the king of the country of Champa, advising that he should concern himself with his own affairs and act in accordance with principles, while paying attention to the protection of his own territory and the maintenance of friendly relations with his neighbours.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 13, page 1738