He was born as a child of Ikkoku URAKAMI, who was a member of the Urakami clan, which was Gozoku (local ruling family) in Urakami no sho Manor in the same Province, and the vassal of the Akamatsu clan, then shugo (provincial constable) of the province.
同国浦上荘の豪族で、守護・赤松氏の家臣・浦上氏の一族・浦上一国の子として生まれた。