Emperor Caligula (A.D. 12 to A.D. 41; reign: A.D. 37 to A.D. 41): On March 18th, A.D. 37 Caligula succeeded Tiberius Caesar as the emperor of the Roman Empire. He ruled until he was assassinated which occurred on January 24th, A.D. 41. There are few surviving sources about the reign of Emperor Caligula, although he is described as a noble and moderate ruler during the first six months of his reign. After this, the sources focus upon his cruelty, sadism, extravagance, and sexual perversity, presenting him as an insane tyrant.
Lange's Christian Chronicle 