世継ぎのなかった足利義政は次期将軍として弟の足利義視を指名していましたが、その翌年に子の足利義尚が誕生しました。
Having no son, Yoshimasa Ashikaga designated his younger brother, Yoshimi Ashikaga the next Shogun yet, his son, Yoshihisa Ashikaga was born in the very following year of the designation.
そこで、世継ぎができた以上は指名を撤回して足利義尚を次期将軍に指名すべきであるとする勢力が現れました。
Some stated that since his son was born, Shogun should cancel the designation and designate his son the next Shogun.
足利義政が長く本件につき明言することを避けていたため、いずれを次期将軍とするかで有力な守護大名が両軍に分かれ、1467年に武力衝突してしまいました。
Because Yoshimasa Ashikaga had been avoiding articulating his position about this issue for a long time, some powerful Shugo feudal lords were divided into the 2 troops and going into a battle in 1467 to decide which would be the next Shogun.
この点、実際にはいずれが幕府の要職に就くかを賭けて両軍に分かれた有力な守護大名たちでしたが、各々の軍に加勢した有力な守護大名の子たちにも独自の思惑がありました。
As well as those powerful Shugo feudal lords were divided into the 2 troops actually to get the important posts in Bakufu, those children of powerful Shugo feudal lords had their own reason to join these troops.
相続で田分けをしたことが鎌倉時代の武士を困窮させたという反省により室町時代には家督を継ぐ者のみが家の全財産を相続するようになっており、有力な守護大名の家々では当時大きな家督争いが起きていました。
Reflecting that Samurai got extremely poor due to the inheritance process in Kamakura Period, Samurai in Muromachi Period was letting only those who yield the headship of their families inherit all the estate, and each family of powerful Shugo feudal lords at the time was having a major in-house trouble deciding who’d yield the headship of the family.
そこで、有力な守護大名の子たちは勝ち馬に乗って家督争いで優位に立とうとしていたのです。
So, those children joined these troops to make some achievements and to get a better chance of yielding the headship of their families.
この内乱は「応仁（元号）の乱」として知られています。
This civil war is known as “the Civil War in Onin (the name a Japanese era)”.
