Xuan-de: Year 6, Month 4, Day 22
2 Jun 1431
The Emperor was advised that coastal residents had been privately going to fan countries to engage in trade and were going beyond the borders to have dealings with yi people. It was ordered that the Auxiliary Censorate publicly make known the prohibition against such activities.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 20, page 1813