Roman Empire By Fuly04 753 BCE Romolus and Remus founded Rome 60 BCE The First Triumvirate was founded by Julius Caesar, Crassus and Pompeius. 48 BCE Pompeius was defeated at Pharaos and went to Egypt, where he was assassinated. 44 BCE Caesar was killed by Brutus 43 BCE The Second Triumvirate was formed to defeat Caesar's assassins. 42 BCE Octavian, Mark Anthony and Lepidus defeated Brutus and Cassius at Philippi. 27 BCE Augustus became the first Roman Emperor 395 Valentinian I. Roman Co-Emperor and Ruler of the Western Roman Empire, died when he was 54 years old. 451 Roman general Flavius Aetius defeated Attila the Hun in the Battle of Catalunian Plains 476 Romolus Augustulus resigned after Rome had been conquered by Odoacer. The End of the Western Roman Empire.