The first part of Mihiragula seems to be the name of the Persian deity Mithra, but his patron deity was Siva, and he left behind him the reputation of a ferocious persecutor of Buddhism.
On the works of men here below a strict reckoning will be held in heaven (according to later representations, by Rashnu, the genius of justice, and Mithra).
But we have a building inscription from Persepolis, which contains his name and genealogy, and invocations of Ahuramazda and Mithra.
As they all bear Aryan names, and in some of their treaties appear Aryan deities (Indra, Varuna, Mithra, &c.), it is clear that Mesopotamia had now a further new element in its population, bearing apparently the name Kharri.
On the sixteenth day of the seventh month a feast is held in honour of Mithra, the deity presiding over and directing the course of the sun, and also a festival to celebrate truth and friendship. On the tenth day of the eighth month a festival is held in honour of Farvardin, the deity who presides over the departed souls of men.