Zheng-tong: Year 13, Month 8, Day 24
21 Sep 1448
The Qian-guo Duke Mu Bin, regional commander of Yun-nan, and others sent the gold and silver utensils, trained elephants and the yi persons (夷口) which had been given as presents by Si Ji-fa, as well as the chieftains he had sent as envoys, to the capital. The Emperor ordered that the chieftains be attached to the Embroidered-Uniform Guard as elephant attendants.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 29, page 3267