八王之乱
Sima Ai (司馬乂) (277 – March 19, 304), courtesy name Shidu (士度), formally Prince Li of Changsha (長沙厲王), was a Jin Dynasty (266–420) imperial prince who briefly served as regent for his brother Emperor Hui. He was the fifth of the eight princes commonly associated with the War of the Eight Princes. Of the eight princes, he alone received praises from historians, for his attempt to reform government and his courtesy to his developmentally disabled brother, Emperor Hui. According to the Book of Jin, Sima Ai was a strong and resolute man and was seven "chi" and five "cun" tall (approximately 1.84 metres).