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
But the senate attached so little importance to the man, that it confined him in an Italian town without taking steps to have him even seriously guarded. Thus he had escaped to Miletus, where the civic authorities once more seized him and asked the Roman commissioners what they should do with the prisoner. The latter advised them to let him go; and they did so. He now tried his fortune further in Thrace; and, singularly enough, he obtained recognition and support there not only from Teres the chief of the Thracian barbarians, the husband of his father's sister, and Barsabas, but also from the prudent Byzantines.
With Thracian support the so-called Philip invaded Macedonia, and, although he was defeated at first, he soon gained one victory over the Macedonian militia in the district of Odomantice beyond the Strymon, followed by a second on the west side of the river, which gave him possession of all Macedonia. Apocryphal as his story sounded, and decidedly as it was established that the real Philip, the son of Perseus, had died when eighteen years of age at Alba, and that this man, so far from being a Macedonian prince, was Andriscus a fuller of Adramytium, yet the Macedonians were too much accustomed to the rule of a king not to be readily satisfied on the point of legitimacy and to return with pleasure into the old track.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=69