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
Illyria - Dalmatians - Their Subjugation
A problem similar to that in the north-west had to be dealt with in the north-east of Italy; it was in like manner not wholly neglected, but was solved still more imperfectly than the former. With the foundation of Aquileia (571) the Istrian peninsula came into possession of the Romans;(5) in part of Epirus and the former territory of the lords of Scodra they had already ruled for some considerable time previously.
5. Cf. III. VII. Measures Adopted to Check the Immigrations of the Transalpine Gauls
But nowhere did their dominion reach into the interior; and even on the coast they exercised scarcely a nominal sway over the inhospitable shore-belt between Istria and Epirus, which, with its wild series of mountain-caldrons broken neither by river-valleys nor by coast-plains and arranged like scales one above another, and with its chain of rocky islands stretching along the shore, separates more than it connects Italy and Greece. Around the town of Delminium (on the Cettina near Trigl) clustered the confederacy of the Delmatians or Dalmatians, whose manners were rough as their mountains.
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Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=11