Analysis of information sources in references of the Wikipedia article "میثراس" in Persian language version.
It is therefore highly likely that it was in the context of Mithridates' alliance with the Cilician pirates that there arose the synchretistic link between Perseus and Mithra which led to the name Mithras (a Greek form of the name Mithra) being given to the god of the new cult.
Cumont's... argument was straightforward and may be summarized succinctly: the name of the god of the cult, Mithras, is the Latin (and Greek) form of the name of an ancient Iranian god, Mithra; in addition, the Romans believed that their cult was connected with Persia (as the Romans called Iran); therefore we may assume that Roman Mithraism is nothing other than the Iranian cult of Mithra transplanted into the Roman Empire.
The name Mithras comes from a root mei- (which implies the idea of exchange), accompanied by an instrumental suffix. It was therefore a means of exchange, the 'contract' which rules human relations and is the basis of social life. In Sanskrit, mitra means 'friend' or 'friendship', like mihr in Persian. In Zend, mithra means precisely the 'contract', which eventually became deified following the same procedure as Venus, the 'charm' for the Romans. We find him invoked with Varuna in an agreement concluded c. 1380 BC between the king of the Hittites, Subbiluliuma, and the king of Mitanni, Mativaza....It is the earliest evidence of Mithras in Asia Minor.
India's sacred literature refers to him since the hymns of the Rig Veda. But it was in Iran where Mithras rose to the greatest prominence: rebounding after the reforms of Zarathustra, Mithras became one of the great gods of the Achaemenian emperors and to this very day he is worshipped in India and Iran by Parsees and Zarathustrians.
All theories of the origin of Mithraism acknowledge a connection, however vague, to the Mithra/Mitra figure of ancient Aryan religion.
The theory that the complex iconography of the characteristic monuments (of which the oldest belong to the second century A.C.) could be interpreted by direct reference to Iranian religion is now widely rejected; and recent studies have tended greatly to reduce what appears to be the actual Iranian content of this "self consciously 'Persian' religion", at least in the form which it attained under the Roman empire. Nevertheless, as the name Mithras alone shows, this content was of some importance; and the Persian affiliation of the Mysteries is acknowledged in the earliest literary reference to them.
First of all, he was the god of contract and mutual obligation. In a cuneiform tablet of the 15th century bc that contains a treaty between the Hittites and the Mitanni, Mithra is invoked as the god of oath. Furthermore, in some Indian Vedic texts the god Mitra (the Indian form of Mithra) appears both as “friend” and as “contract. ” ...In short, Mithra may signify any kind of communication between men and whatever establishes good relations between them.
However, in 1971 the First International Congress of Mithraic Studies was held in Manchester England... Was it not possible, scholars at the Congress asked, that the Roman cult of Mithras was actually a new religion, and had simply borrowed the name of an Iranian god in order to give itself an exotic oriental flavor?