Roman emperor from A.D. 37 to 41, youngest son of Germanicus and Agrippina, born at Antium; having ingratiated himself with Tiberius, was named his successor; ruled with wisdom and magnanimity at first, while he lived in the unbridled indulgence of every lust, but after an illness due to his dissipation, gave way to the most atrocious acts of cruelty and impiety; would entertain people at a banquet and then throw them into the sea; wished Rome had only one head, that he might shear it off at a blow; had his horse installed as consul in mockery of the office; declared himself a god, and had divine honours paid to him, till a conspiracy was formed against him on his return from an expedition into Gaul, when he was assassinated (12-41).