Yong-le: Year 19, Month 9, Day 11
7 Oct 1421
The Feng-cheng Marquis Li Bin, regional commander of Jiao-zhi, memorialized: "The rebellious bandit Li Li fled into Laos and I ordered the troops to pursue and apprehend him. However, Laos then sent the chieftains Lan Qi and Lang Gu to request that the Imperial troops not enter their territory. Thereupon, the troops were sent to conduct a search within the territory of Laos. It turned out that Li Li was there. Thus, the chieftains were sent to the general military headquarters. At this time Li Li has not appeared for quite a long period." The Emperor, on reading the memorial, suspected that Laos was concealing the bandit. Thus Imperial orders were sent to Bin requiring him to send Lan Qi and Lang Gu to Bei-jing for investigation.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 14, page 2289/90