During Zhu Di's revolt, he was promoted and climbed to Grand court
This man's family claimed descent from King Mohammed of Bukhara; while in Ceylon he was challenged by, but later captured, King Alagonakkara. During Zhu Di's revolt, he was promoted and climbed to Grand court [*] Eunuch after Zhu Di became Emperor Yong Le.  After being castrated at age ten, he was sent on seven diplomatic missions as China's number one envoy.  For 10 points, name this Chinese voyager who explored Africa and Southern Asia during the early 15th century under Ming Emperor Yong Le of China.
This man's family claimed descent from King Mohammed of Bukhara; while in Ceylon he was challenged by, but later captured, King Alagonakkara.
{Zheng} He [accept {Cheng Ho} or other reasonable pronunciations; accept {Ma He}]