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
Ptolemy Philopator of Egypt had died in 549. Philip and Antiochus, the kings of Macedonia and Asia, had combined against his successor Ptolemy Epiphanes, a child of five years old, in order completely to gratify the ancient grudge which the monarchies of the mainland entertained towards the maritime state. The Egyptian state was to be broken up; Egypt and Cyprus were to fall to Antiochus Cyrene, Ionia, and the Cyclades to Philip. Thoroughly after the manner of Philip, who ridiculed such considerations, the kings began the war not merely without cause but even without pretext, "just as the large fishes devour the small."
The allies, moreover, had made their calculations correctly, especially Philip. Egypt had enough to do in defending herself against the nearer enemy in Syria, and was obliged to leave her possessions in Asia Minor and the Cyclades undefended when Philip threw himself upon these as his share of the spoil. In the year in which Carthage concluded peace with Rome (553), Philip ordered a fleet equipped by the towns subject to him to take on board troops, and to sail along the coast of Thrace.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=22