Yagura

Yagura was the fourth mizukage and the Jinchuriki of the Three Tailed Giant Turtle

Past
While Yagura was mizukage of the Hidden Mist Village it was known as Village of the Bloddy Mist because of academy students havin to kill eachother to graduate.This ended when Zabuza Momochi murdered a group of academy students. Zabuza probably tried to assassinate Yagura when he revolted.