This chapter explores the career of Wu Kezhong from 1418, the year he succeeded his father’s investiture as Marquis of Gongshun, to 1449, the year he fell in combat. Like his father, Wu Kezhong served the Ming throne as a Mongolian specialist and military commander. Batu-Temür had offered his loyalty to the Ming throne at the head of some 5,000 supporters, and Wu Kezhong too acted as a patron and protector for the Mongolian community. Despite such similarities, both the dynasty and the place of Mongols in the polity were changing. Wu Kezhong was among the first generation of his family to live through imperial successions as first the Yongle and then Xuande emperor died, leaving the throne to new sovereigns who actively sought the support of proven commanders such as Wu Kezhong. The new sovereigns, especially the man for whom Wu Kezhong and his brother died, differed importantly from their forefathers not only in their styles of rulership but also in their policies. That mattered because, even more than his father, Wu Kezhong pursued patronage through imperial institutions, which required knowledge of salary structures, commutation rates, and the shifting balance of power at court.