When Yoshiaki asked assistance from Nobunaga ODA who was a daimyo of Owari Province and Mino Province, Yasuyuki went to his temporal residence and began to serve Fujitaka HOSOKAWA.
康之は、義昭が尾張・美濃の大名・織田信長を頼ったときにその宿所を訪れ、やがて藤孝の下で働くようになる。