Which famous Japanese writer committed a ritual suicide often referred to as "harakiri"?

He was a Nationalist and attempted a coup. He failed which is why he committed sepuku.

frank, Hara kiri is ritual form of suicide , used by defeated or dishonoured Samurai . It is hara(belly)kiri(cutting) , or self disembowelment. For an honourable death , the actual death is caused by the “friend who helps when it is necessary to die” cutting your head off

Player #7719043, The name is Kaishakunin