<human>:  Why did the Romans worship Mithras?
<bot>: Mithras was a god from Persia who was worshipped by the Romans. He was a god of light and the sun. The Romans believed that Mithras had helped them defeat the evil forces of darkness. The Romans also believed that Mithras would return at the end of time to judge humanity and reward those who were good and punish those who were bad.