Caracalla thought himself a reincarnated Alexander the Great. In reality, he was a tyrant and a mass murderer. After some actors in Alexandria mocked Caracalla's rumored role in his brother's death, Caracalla butchered thousands of people in the city. The emperor then launched a failed campaign against Parthia. The only reason government continued to function was due to Caracalla's dutiful and wise mother, Julia Domna. By AD 217, her son Caracalla would be killed under the orders of his own Praetorian Prefect.