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
Reaction of the East against the West
This revolution in the relations of the peoples in the interior of Asia is the turning-point in the history of antiquity. The tide of national movement, which had hitherto poured from the west to the east and had found in Alexander the Great its last and highest expression, was followed by the ebb. On the establishment of the Parthian state not only were such Greek elements, as may still perhaps have been preserved in Bactria and on the Indus, lost, but western Iran also relapsed into the track which had been abandoned for centuries but was not yet obliterated.
The Roman senate sacrificed the first essential result of the policy of Alexander, and thereby paved the way for that retrograde movement, whose last offshoots ended in the Alhambra of Granada and in the great Mosque of Constantinople. So long as the country from Ragae and Persepolis to the Mediterranean obeyed the king of Antioch, the power of Rome extended to the border of the great desert; the Parthian state could never take its place among the dependencies of the Mediterranean empire, not because it was so very powerful, but because it had its centre far from the coast, in the interior of Asia.
Since the time of Alexander the world had obeyed the Occidentals alone, and the east seemed to be for these merely what America and Australia afterwards became for the Europeans; with Mithradates I the east re-entered the sphere of political movement. The world had again two masters.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=111