His date of birth is unknown, but Yukinaga, who was believed to be his grandfather, and Nagamitsu, who was believed to his father, were killed in war in 1520, so his date of birth would have been earlier than the date of his father's death if he was Nagamitsu's son.
生年は不明だが、永正12年（1520年）、祖父とされる之長と父とされる長光が戦死しており、長光の子だとすれば出生はそれ以前ということになる。