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
Antiochus the Great
In the kingdom of Asia the diadem of the Seleucidae had been worn since 531 by king Antiochus the Third, the great-great-grandson of the founder of the dynasty. He had, like Philip, begun to reign at nineteen years of age, and had displayed sufficient energy and enterprise, especially in his first campaigns in the east, to warrant his being without too ludicrous impropriety addressed in courtly style as "the Great."
He had succeeded--more, however, through the negligence of his opponents and of the Egyptian Philopator in particular, than through any ability of his own--in restoring in some degree the integrity of the monarchy, and in reuniting with his crown first the eastern satrapies of Media and Parthyene, and then the separate state which Achaeus had founded on this side of the Taurus in Asia Minor.
A first attempt to wrest from the Egyptians the coast of Syria, the loss of which he sorely felt, had, in the year of the battle of the Trasimene lake, met with a bloody repulse from Philopator at Raphia; and Antiochus had taken good care not to resume the contest with Egypt, so long as a man--even though he were but an indolent one--occupied the Egyptian throne.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp