Yao Guangxiao

Type Figure Region Suzhou Time 1335–1418 Also known as Daoyan、Junior Preceptor Yao、Black-robed Chancellor

Monk, strategist, and scholar of the early Ming. His dharma name was Daoyan, versed in Buddhist, Daoist, and Confucian learning.…

Timeline

1400–1402Prince Yan's palace, Beiping · BeijingEntering and leaving the Yan palace as a monk, he devised Jingnan strategy for Zhu Di, liaising with internal collaborators, and joined in important military decisions, the core brain of the war for the throne.
1402–1410Nanjing · NanjingEarly in the Yongle era he was made Junior Preceptor to the Crown Prince, remaining in Nanjing to assist the regent crown prince, joining in planning major state policies such as the capital move and the great encyclopedia's compilation; though wearing monk's robes and holding no secular office, he wielded immense power for a time.

姚广孝 https://zh.wikipedia.org/wiki/%E5%A7%9A%E5%B9%BF%E5%AD%9D
The Cambridge History of China, Volume 7: The Ming Dynasty, 1368–1644, Part 1 — Frederick W. Mote; Denis Twitchett (eds.) (1988)