Xu Da
Zhu Di grew up as a prince in a loving, caring environment. His father supplied nothing but the best education and, trusting them alone, reestablished the old feudal principalities for his many sons. Zhu Di was created Prince of Yan, a location important for being both the former capital of the Mongol-led Yuan dynasty and the frontline of battle against Northern Yuan dynasty, a successor state to the Yuan dynasty. When Zhu Di moved to Beiping, the former Khanbaliq of Yuan, he found a city that had been devastated by famine and disease, but he worked with his father's general Xu Da who was also his own father-in-law to continue the pacification of the region. The official Ming histories portray a Zhu Di who impressed his father with his energy, daring, and leadership amid numerous successes; nonetheless, the Ming dynasty suffered numerous reverses during his tenure and the great victory at Buir Lake was won not by Zhu Di but by his brother's partisan Lan Yu. Similarly, when the Hongwu Emperor sent large forces to the north, they were not placed under Zhu Di's command.