He became emperor from a farmer.

When he was a farmer, he want to became Japanese soldier”Samurai”.

Great Nobunaga hired him Samurai.

He was good at communicating other people.

He got some support from many people.

He was promoted quickly, and Nobunaga gave him “Nagahama castle” as a reward.

When he tried to attack “Mouri” in the western part of Honshu Island,

Nobunaga was killed by “Akechi Mitsuhide”.

He succeed in avenge, he killed “Akechi Mitsuhide”.

And He became emperor of Japan.

(from wikipedia)