It is said that he was either the 4th son of Shugo Daimyo (Governor feudal lord) Mochikiyo KYOGOKU, or the child of Katsuhide KYOGOKU, who was Mochikiyo's progeny, and he went by the childhood name of Otsudojimaru.
守護大名である京極持清の四男とも、持清の嫡子京極勝秀の子ともされ、幼名は乙童子丸と称した。