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
An attempt of this kind which was made on a route hitherto little known to the Romans, in the innermost recess of the Adriatic, and still more, as if would seem, the project of Philip of Macedonia for invading Italy from the east as Hannibal had done from the west, gave occasion to the founding of a fortress in the extreme north-eastern corner of Italy--Aquileia, the most northerly of the Italian colonies (571-573)--which was intended not only to close that route for ever against foreigners, but also to secure the command of the gulf which was specially convenient for navigation, and to check the piracy which was still not wholly extirpated in those waters.
The establishment of Aquileia led to a war with the Istrians (576, 577), which was speedily terminated by the storming of some strongholds and the fall of the king, Aepulo, and which was remarkable for nothing except for the panic, which the news of the surprise of the Roman camp by a handful of barbarians called forth in the fleet and throughout Italy.
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Reference address : https://www.ellopos.net/elpenor/rome/3-07-peace-hannibal-third-period.asp?pg=5