Wulu was a grandson of Aguda (Emperor Taizu), the founding emperor of the Jin dynasty. His father was Eliduo (訛里朵; also known as Wanyan Zongyao 完顏宗堯), Aguda's third son and a famous general in the early Jin dynasty. As Eliduo died when Wulu was just 12 years old, the latter grew up under the influence of his mother, who had come from a sinicised "bohai" gentry family from Liaoyang. After her husband's death, Wulu's mother preferred to become a nun instead of remarrying one of her husband's relatives, as was the Jurchen custom. Due to his mother and her relatives, Wulu received a Han Chinese-style education and acquired good knowledge of the Chinese classics.