Emperor Xiaowen of Northern Wei
The ancestors of the "Du" family are known as the Tangdu. The Tangdu resided southeast of Xi'an in Shaanxi province. The "Fan" (范) and "Du" clans share a common ancestor. Some members of the "Du" (杜) family are the Tuoba (拓跋) family of Emperor Xiaowen of Northern Wei. "Dugu" is the surname of Xianbei.