Yong-le: Year 15, Month 3, Day 1
18 Mar 1417
Deng De and other tribute students who had been chosen from Bei River and other prefectures, subprefectures and counties in Jiao-zhi, arrived in the capital. It was ordered that they be sent to the Directorate of Education to begin studies and that presents in line with those given to the students from Yun-nan be conferred upon them. Earlier, when the Emperor had pacified Jiao-zhi, he had ordered that the prefectures and counties establish schools and that pupils be educated and trained. At this time, Jiao-zhi began to send tribute students.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 13, page 1990