Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Worship of Mithra
A fresh addition was the Persian worship, which is said to have first reached the Occidental through the medium of the pirates who met on the Mediterranean from the east and from the west; the oldest seat of this cultus in the west is stated to have been Mount Olympus in Lycia.
That in the adoption of Oriental worships in the west such higher speculative and moral elements as they contained were generally allowed to drop, is strikingly evinced by the fact that Ahuramazda, the supreme god of the pure doctrine of Zarathustra, remained virtually unknown in the west, and adoration there was especially directed to that god who had occupied the first place in the old Persian national religion and had been transferred by Zarathustra to the second--the sun-god Mithra.
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Reference address : http://www.ellopos.net/elpenor/rome/5-12-religion-culture-literature-art.asp?pg=4