Final answer:
Julius Caesar ruled as dictator beginning in 48 BCE until his assassination on the Ides of March, 44 BCE, by senators including Brutus and Cassius. His death marked the transition from the Roman Republic to the Roman Empire under Augustus Caesar.
Step-by-step explanation:
Julius Caesar was appointed dictator in 48 BCE and then for a ten-year term in 46 BCE. His dictatorship was made permanent, effectively for life, in 44 BCE. Caesar's attempt to consolidate power and enact reforms alarmed many Romans who saw him as a tyrant. This culminated in his assassination on the Ides of March (March 15), 44 BCE, by a group of senators.
The most noted conspirators in the assassination were Marcus Junius Brutus and Gaius Cassius Longinus. After Caesar's death, Rome experienced a period of chaos, which eventually led to the rise of the first Roman Emperor, Augustus Caesar, marking the end of the Roman Republic and the beginning of the Roman Empire.