Akechi Mitsuhide was a SAMURAI who is famous by having rebellion against Oda Nobunaga at Honnouji.
He was given an important post when he started to serve Nobunaga because he was a very intelligent SAMURAI.
However, it's said that the difference in their way of thinking lead to a worse relationship.
He has long been considered that he was betrayer, since he murdered Nobunaga.
However, he was really talented in both the domestic administration and military affairs and seemed to be respected as the Lord.
No one knows the real reason why he murdered Nobunaga.
There is a theory that he hated Nobunaga, on the other hand, another theory is that there was a wirepuller other than him.
However, many Japanese dramas and novels adopt the opinion that he disliked Nobunaga.
By the way, there is an interesting story concerning him.
It's known that after Mitsuhide murdered Nobunaga, he was murdered by Toyotomi Hideyoshi, and Tokugawa Ieyasu conquered Japan after death of the Hideyoshi.
However, some people believe that in fact, Mitsuhide was not murdered, and he became a Buddhist priest named Tenkai and served Ieyasu.
There are many mysteries in history, but this is one of the most interesting thing in those.