燕王
He was born as second son to Kublai Khan and Chabi Khatun. The Chinese Zen monk Haiyun gave him the name Zhenjin ("True Gold") when he was born in 1243. He was created Prince of Yan (燕王), became the head of the Central Secretariat ("Zhongshu Sheng") by his father in 1262, and was designated as the Crown Prince (皇太子) of the Yuan dynasty by Kublai Khan in 1273.