History of the Roman Empire from this point on, leading his biographers to label him as insane. Most of what history remembers of Caligula comes from Suetonius, in his book "Lives of the Twelve Caesars". According to Suetonius, Caligula once planned to appoint his favourite horse Incitatus to the Roman Senate. He ordered his soldiers to invade Britain to fight the Sea God Neptune, but changed his mind at the last minute and had them pick sea shells on the northern end of France instead. It is believed he carried on incestuous relations with his three sisters: Julia Livilla, Drusilla and Agrippina the Younger. He
Holy Roman Emperor Holy Roman Emperor The Holy Roman Emperor (historically "", "Emperor of the Romans") was the ruler of the Holy Roman Empire (800/962-1806 AD, from Charlemagne/Otto I to Francis II). The title was, almost without interruption, held in conjunction with the rule of the Kingdom of Germany. From an autocracy in Carolingian times the title evolved into an elected monarchy chosen by the prince-electors. The Holy Roman Emperor was widely perceived to rule by divine right, though he often contradicted or rivaled the Pope, most notably during the Investiture controversy. In theory, the Holy Roman Emperor was "primus inter pares" (first