the worship of Mithra, the Iranian god of the sun, justice, contract, and war in pre-Zoroastrian Iran. Known as Mithras in the Roman Empire during the 2nd and 3rd centuries AD, this deity was honoured as the patron of loyalty to the emperor. After the acceptance of Christianity by the emperor Constantine in the early 4th century, Mithraism rapidly declined.
MITHRAISM
Meaning of MITHRAISM in English
Britannica English vocabulary. Английский словарь Британика. 2012