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
Ferdinand II, Holy Roman Emperor Bohemian Estates defeated him. The Bohemian Estates dethroned Rudolph and elected Matthias king on 23 May 1611. Since Rudolph retained the title of emperor, his succession in the Holy Roman Empire remained uncertain. Matthias, Ferdinand and Maximilian III assembled at Vienna to discuss the issue with Philip III's envoy, Baltasar de Zúñiga, in December. They decided to support Matthias' election as King of the Romans (which could have secured his right to succeed Rudolph II), but the three ecclesiastical electors opposed the plan because of Matthias' concessions to the Protestants in Hungary, Austria and Bohemia. Matthias was elected Holy Roman