Background
His father, Ashikaga Yoshiharu was the twelfth shogun, and his brother, Ashikaga Yoshiteru was the thirteenth shogun.
足利 義昭
His father, Ashikaga Yoshiharu was the twelfth shogun, and his brother, Ashikaga Yoshiteru was the thirteenth shogun.
The absence of an effective central authority in the capital of Japan had lasted until the warlord Oda Nobunaga"s armies entered Kyoto in 1568, re-establishing the Muromachi Shogunate under the puppet shogun Ashikaga Yoshiaki to begin the Azuchi–Momoyama period. Ashikaga Yoshihide, the fourteenth shogun, was deposed without ever entering the capital. Most historians consider 1573 to have been the year in which the Ashikaga shogunate ended.
The power of the Ashikaga was effectively destroyed on August 27, 1573 when Nobunaga drove Yoshiaki out of Kyoto.
Some note that Yoshiaki did not formally relinquish his empty title. And for this reason, the empty shell of the shogunate could be said to have continued for several more years.
Significant events shape the period during which Yoshiaki was shogun:
1568 – Oda Nobunaga sets Yoshiaki up as shogun. 1569 – Yoshiaki"s Nijō residence is built.
1570 – Ikkō monks defeat Oda Nobunaga.
1571 – Oda Nobunaga destroys Enryaku-ji. 1573 – Takeda Shingen dies. Yoshiaki is deposed. 1588 – Yoshiaki officially resigns from his post as Shogun.
The span of years in which Yoshiaki was shogun are more specifically identified by more than one era name or nengō.
Eiroku (1558–1570)
Genki (1570–1573)
Tenshō (1573–1592).