Hōgen Rebellion
After the Hōgen Rebellion, the Taira cut the sinews of Tametomo's left arm, limiting the use of his bow, and then he was banished to the island of Ōshima in the Izu Islands. Tametomo eventually killed himself by slicing his abdomen, or committing seppuku. He is quite possibly the first warrior to commit "seppuku" in the chronicles.