Yong-le: Year 6, Month 6, Day 11
4 Jul 1408
The Xin-cheng Marquis Zhang Fu advised: "Jiao-zhi has been pacified and the various offices have been established. There is a need, both when the Court is sending officials and when the various offices memorialize reports, for postal relay stations. It is appropriate that we establish a further 19 postal relay river stations and postal relay horse stations in the prefectures of Gui-lin, Liu-zhou, Nan-ning and Tai-ping in Guang-xi. From the Dong-jiang postal relay station in Gui-lin Prefecture to Ping-xiang County in Si-ming Prefecture there are 31 old and new postal relay horse stations. Where the distance between stations is too great, intermediate stations should be established. The water route from Nan-ning Prefecture to Long Subprefecture and other stations has long distances between stations. We should increase the number of stations and boats and establish transport offices." He also said that five commanderies in Jiao-zhi, including Tai-yuan had already been changed into subprefectures, but that 13 other townships, including Tian-guan, had not been so changed. The Emperor sent orders to the relevant authorities approving the proposals and requiring their implementation.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 11, page 1069/70