Xuan-de: Year 4, Month 7, Day 3
2 Aug 1429
It was ordered that Zhen, the nephew of the deceased Jiao-zhi Assistant Commissioner Zhai Cheng inherit, as proxy, the position of vice commander of the Jin-wu Forward Guard. At this time, Cheng's son Ying had become debilitated by illness. The Emperor ordered that if Ying had a son who could inherit the post, it should be given to him.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 19, page 1327/28