When MINAMOTO no Yoshikuni started to work in Kyoto, Tsunekuni was placed under his custody and later celebrated his coming of age with Yoshikuni serving as eboshioya (a person who put an eboshi [formal headwear for court nobles] on a young man's head on his coming of age ceremony).
源義国が上洛し、京都で活動を始めると、義国邸に引き取られ、後に義国を烏帽子親として元服した。