苻登
Fu Deng was born in 343, to Fu Chang (苻敞), a distant grandnephew of Former Qin's founder Fu Jiàn, while still under Later Zhao rule. After Fu Jiàn founded Former Qin in 351, Fu Chang served as a general and a commandery governor. During the reign of Fu Jiàn's cruel and whimsical son Fu Sheng (r. 355–357), Fu Chang was executed, but he was posthumously honored after Fu Sheng was overthrown by his cousin Fu Jiān. Fu Jiān was impressed by Fu Deng's abilities, and when he grew older, Fu Deng was made the county magistrate of the capital Chang'an. Later, however, for unspecified faults, he was demoted to be the county magistrate for Didao (狄道, in modern Dingxi, Gansu).