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
Matters began to look as if Antiochus wished to possess himself of all Egypt in Philometor's name; Alexandria accordingly closed its gates against him, deposed Philometor, and nominated as king in his stead his younger brother, named Euergetes II, or the Fat. Disturbances in his own kingdom recalled the Syrian king from Egypt; when he returned, he found that the brothers had come to an understanding during his absence; and he then continued the war against both.
Just as he lay before Alexandria, not long after the battle of Pydna (586), the Roman envoy Gaius Popillius, a harsh rude man, arrived, and intimated to him the command of the senate that he should restore all that he had conquered and should evacuate Egypt within a set term. Antiochus asked time for consideration; but the consular drew with his staff a circle round the king, and bade him declare his intentions before he stepped beyond the circle.
Antiochus replied that he would comply; and marched off to his capital that he might there, in his character of "the god, the brilliant bringer of victory," celebrate in Roman fashion his conquest of Egypt and parody the triumph of Paullus.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=47