Bastarnae
Genthius
Of greater moment were the efforts made to stir up the northern barbarians and the Hellenes to rebellion against Rome. Philip had conceived the project of crushing the old enemies of Macedonia, the Dardani in what is now Servia, by means of another still more barbarous horde of Germanic descent brought from the left bank of the Danube, the Bastarnae, and of then marching in person with these and with the whole avalanche of peoples thus set in motion by the land-route to Italy and invading Lombardy, the Alpine passes leading to which he had already sent spies to reconnoitre—a grand project, worthy of Hannibal, and doubtless immediately suggested by Hannibal’s passage of the Alps. It is more than probable that this gave occasion to the founding of the Roman fortress of Aquileia,(2) which was formed towards the end of the reign of Philip (573), and did not harmonize with the system followed elsewhere by the Romans in the establishment of fortresses in Italy. The plan, however, was thwarted by the desperate resistance of the Dardani and of the adjoining tribes concerned; the Bastarnae were obliged to retreat, and the whole horde were drowned in returning home by the giving way of the ice on the Danube. The king now sought at least to extend his clientship among the chieftains of the Illyrian land, the modern Dalmatia and northern Albania. One of these who faithfully adhered to Rome, Arthetaurus, perished, not without the cognizance of Perseus, by the hand of an assassin. The most considerable of the whole, Genthius the son and heir of Pleuratus, was, like his father, nominally in alliance with Rome; but the ambassadors of Issa, a Greek town on one of the Dalmatian islands, informed the senate, that Perseus had a secret understanding with the young, weak, and drunken prince, and that the envoys of Genthius served as spies for Perseus in Rome.
Cotys
In the regions on the east of Macedonia towards the lower Danube the most powerful of the Thracian chieftains, the brave and sagacious Cotys, prince of the Odrysians and ruler of all eastern Thrace from the Macedonian frontier on the Hebrus (Maritza) down to the fringe of coast covered with Greek towns, was in the closest alliance with Perseus. Of the other minor chiefs who in that quarter took part with Rome, one, Abrupolis prince of the Sagaei, was, in consequence of a predatory expedition directed against Amphipolis on the Strymon, defeated by Perseus and driven out of the country. From these regions Philip had drawn numerous colonists, and mercenaries were to be had there at any time and in any number.