 He was given the name of Marcus Annius Verus because it was the original name of his father, Marcus Aurelius.On 12 October 166 AD, during a triumph celebrating the victory of the Romans in the Parthian War of Lucius Verus, Annius and his elder brother Commodus were both made caesars, designating them as co-heirs to the Roman Empire.At the time, Annius was three, and Commodus was five.