Yuan Xi
After Emperor Xiaowen's death in 499 and succession by hisson Emperor Xuanwu, Yu Deng's father Yu Lie continued to serve in the administration, and Yu Lie soon ran into conflicts with one of the regents, Emperor Xuanwu's uncle Yuan Xi (元禧) the Prince of Xianyang, over Yuan Xi's arrogance and wastefulness, as well as Yuan Xi's use of items that were supposed to be only usable by the emperor. Yu Deng was by this point an attendant of the emperor, and through him, Yu Lie reported Yuan Xian's faults to the emperor, leading to Emperor Xuanwu's relieving Yuan Xi and another uncle, Yuan Xie the Prince of Pengcheng, of their responsibilities in 501. When Yuan Xi planned a rebellion later that year, Yu Deng was involved in protecting Emperor Xuanwu arresting Yuan Xi and his cohorts, and was rewarded for his accomplishments. Emperor Xuanwu also changed his name further to Yu Zhong—with "Zhong" meaning "faithful."