In 1540, he had his coming of age ceremony and received one character from the name of Yoshiharu ASHIKAGA, the 12th Shogun of the Muromachi Shogunate, taking the name Harutsugu.
天文9年（1540年）に元服し、室町幕府第12代将軍足利義晴から一字を賜り晴嗣と称する。