Hong-wu: Year 26, Month 3, Day 3
14 Apr 1393
The minister Ban-nan-su-la, who had been sent by the country of Burma, offered local products. Previously, when the Emperor ascended the throne, envoys were sent to go and instruct this place. The envoys returned having been unable to reach there. Subsequently, the country of Ba-bai had sent its envoy Hong-du to offer tribute. This envoy had said that the country of Burma was near their borders, but because it was so distant, it was not possible to personally go there. The Emperor thus ordered the Xi-ping Marquis Mu Chun to send an envoy to the country of Ba-bai, and then have their king advise of the Imperial will. At this time, Ba-nan-su-la, who had been sent by Burma, arrived. It was Imperially commanded that fine silks and other silks, as appropriate, be conferred upon the envoys.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 8, page 3303