Caligula : History of the Third Emperor of Rome

Caligula was Emperor of Rome from A.D. 37 to 41. He was the youngest son of Germanicus (nephew of Tiberius) by Agrippina, and was born August 31, A.D. 12, at Antium, and was educated in the camp, where the soldiers gave him the nickname Caligula, from the military boots (caligæ) which he wore...
"The profusion of this emperor, during his short reign of three years and ten months, is unexampled in history. In the midst of profound peace, without any extraordinary charges either civil or military, he expended, in less than one year, besides the current revenue of the empire, the sum of £21,798,875 sterling, which had been left by Tiberius at his death..."