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
Illyrian Peoples - Japydes - Scordisci
If these Celtic and non-Celtic tribes having their settlements upon and beyond the Alpine chain were already variously intermingled, there was, as may easily be conceived, a still more comprehensive intermixture of peoples in the countries on the Lower Danube, where there were no high mountain ranges, as in the more western regions, to serve as natural walls of partition. The original Illyrian population, of which the modern Albanians seem to be the last pure survivors, was throughout, at least in the interior, largely mixed with Celtic elements, and the Celtic armour and Celtic method of warfare were probably everywhere introduced in that quarter.
Next to the Taurisci came the Japydes, who had their settlements on the Julian Alps in the modern Croatia as far down as Fiume and Zeng,--a tribe originally doubtless Illyrian, but largely mixed with Celts. Bordering with these along the coast were the already-mentioned Dalmatians, into whose rugged mountains the Celts do not seem to have penetrated; whereas in the interior the Celtic Scordisci, to whom the tribe of the Triballi formerly especially powerful in that quarter had succumbed, and who had played a principal part in the Celtic expeditions to Delphi, were about this time the leading nation along the Lower Save as far as the Morava in the modern Bosnia and Servia.
They roamed far and wide towards Moesia, Thrace, and Macedonia, and fearful tales were told of their savage valour and cruel customs. Their chief place of arms was the strong Segestica or Siscia at the point where the Kulpa falls into the Save. The peoples who were at that time settled in Hungary, Transylvania, Roumania, and Bulgaria still remained for the present beyond the horizon of the Romans; the latter came into contact only with the Thracians on the eastern frontier of Macedonia in the Rhodope mountains.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=17