Caligula. The son of Germanicus and Agrippina. Caligula was born in A.D. 12. He was named by Tiberius joint heir of the empire. He subsequently became sole emperor, and proved a great tyrant. In the course of a career of incestuous debauchery and degrading voluptuousness, Caligula conceived such a hatred to his subjects that he openly expressed a wish that the Roman people had but a single neck, in order that he might extirpate them at a blow. Caligula was murdered in 41 B.C.