The Indian Mitra was essentially a solar deity, representing the "friendly" aspect of the sun. So too was the Persian derivative Mithra, who was a "benevolent god" and the bestower of health, wealth and food. Mithra also seems to have been looked upon as a sort of Prometheus, for the gift of fire.

According to the Roman historian Plutarch (c. 46-120 AD/CE), Mithraism began to be absorbed by the Romans during Pompey's military campaign against Cilician pirates around 70 BCE. The religion eventually migrated from Asia Minor through the soldiers, many of whom had been citizens of the region, into Rome and the far reaches of the Empire. Syrian merchants brought Mithraism to the major cities, such as Alexandria, Rome and Carthage, while captives carried it to the countryside. By the third century AD/CE Mithraism and its mysteries permeated the Roman Empire and extended from India to Scotland, with abundant monuments in numerous countries amounting to over 420 Mithraic sites so far discovered.
http://www.truthbeknown.com/mithra.htm