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
Of these states Great Armenia in particular, under the Artaxiads, soon attained to a considerable position. Wounds perhaps still more dangerous were inflicted on the empire by the foolish levelling policy of his successor Antiochus Epiphanes (579-590).
Although it was true that his kingdom resembled an aggregation of countries rather than a single state, and that the differences of nationality and religion among his subjects placed the most material obstacles in the way of the government, yet the plan of introducing throughout his dominions Graeco-Roman manners and Graeco-Roman worship and of equalizing the various peoples in a political as well as a religious point of view was under any circumstances a folly; and all the more so from the fact, that this caricature of Joseph II was personally far from equal to so gigantic an enterprise, and introduced his reforms in the very worst way by the pillage of temples on the greatest scale and the most insane persecution of heretics.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=104