Mithras

n. Persian god of light and truth (protector against evil); Persian sun god

The Mithraic Mysteries or Mysteries of Mithras was a mystery religion practised in the Roman Empire, best attested in Rome and Ostia, Mauretania, Britain and in the provinces along the Rhine and Danube frontier. Today, the beliefs of this cult are also referred to as Mithraism, but this is a recent development.
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Noun
1. ancient Persian god of light and truth; sun god
(synonym) Mithra
(hypernym) Persian deity

(n.)
The sun god of the Persians.
  

Mithras (Greek) Mithra, Mitra (Avestan) [from Avestan Mithra from mith, myth light + ra subjective form] Ancient Persian deity; Yusti translates Mithra as the medium between the two lights: the invisible and the visible. Therefore, Mithra means the latent potential ability of understanding and the developing force in nature. It is the hidden beingness, the mysterious force of growth and the invisible light; philosophically, the latent power of cognition; astrologically, the source of the light of the heavens; and mystically, the creative force of love. Ahura-Mazda says: "I have created Mithra as worthy of sacrifice, as worthy of glorification, as I, Ahura Mazda, am myself." In late Persian times he became the god of the sun and of truth and faith. He punishes the Mithra-druj (he who lies to Mithra). He is represented as a judge in hell, in company with Rashnu (the true one, the god of truth) -- who is an aspect of Mithra in his moral character. The Sanskrit Mitra in the Vedas is the god of light and friendship.
As known to the Greeks and Romans, Mithras was the god of the sun, of purity, moral goodness, and knowledge, whose worship spread over the Roman world, especially during the 2nd and 3rd centuries.