Caligula was the third Roman emperor, who reigned from 37 AD until his assassination in 41 AD. Caligula is notorious for being described as one of the ‘worst Roman emperors’, for he became a very cruel leader. It is also possible that after recovering from an illness seven months into his reign, his became mad; Suetonius describes how he intended to make his horse consul, insisted on being treated like a god, and was incestuous with his three sisters. He was assassinated in 41 AD by the Praetorian Guard, his wife Caesonia, and their daughter, at the age of 29.