Qi Jiguang
In 1568, the Longqing Emperor appointed Qi Jiguang as governor and military administrator of Jizhen, Changzhen and Baoding to help train the guards in the area. Qi Jiguang helped to maintain the 2000-li section of the Great Wall, which was finished in 1572. Qi Jiguang, upon noticing that the wall had no abutments, suggested the installation of abutments to officials. His suggestion was approved.