Titus Livius (Livy), The History of Rome, Book 27
Cyrus Evans, Ed.

31. While the king was occupied with the exhibition of the games, and was indulging himself during the days devoted to festivity with more freedom than in time of war, Publius Sulpicius, setting out from Naupactus, brought his fleet to the shore, between Sicyon and Corinth, and devastated without restraint a country of the most renowned fertility. [2] Intelligence of this proceeding called Philip away from the games. He set out hastily with his cavalry, ordering his infantry to follow him closely; and attacking the Romans as they were scattered through the fields and loaded with booty, like men who feared nothing of the kind, drove them to their ships. [3] [p. 1135]The Roman fleet returned to Naupactus by no means pleased with their booty. The fame of a victory gained by Philip over the Romans, of whatever magnitude, increased the celebrity of the remaining part of the games. [4] The festival was celebrated with extraordinary mirth, the more so as the king, in order to please the people, took the diadem off his head, and laid aside his purple robe with the other royal apparel, and placed himself, with regard to appearance, on an equality with the rest, than which nothing is more gratifying to free states. [5] By this conduct he would have afforded the strongest hopes of the enjoyment of liberty, had he not debased and marred all by his intolerable lust; for he ranged night and day through the houses of married people with one or two companions, and in proportion as he was less conspicuous by lowering his dignity to a private level, the less restraint lie felt; [6] thus converting that empty show of liberty, which he had made to others, into a cover for the gratification of his own unbounded desires. [7] For neither did he obtain his object in all cases by money or seductive arts, but he also employed violence in the accomplishment of his flagitious purposes; and it was dangerous both to husbands and parents to have presented any impediment to the gratification of royal lust, by an unseasonable strictness. [8] From one man, Aratus, of the highest rank among the Achaeans, his wife, named Polycratia, was taken away and conveyed into Macedonia under the hope of a matrimonial connexion with royalty. [9] After passing the time appointed for the celebration of the Nemaean games, and a few days more, in the commission of these profligate acts, he set out for Dymae to expel the garrison of the Aetolians, which had been invited by the Eleans, and received into the town. [10] Cycliadas, who had the chief direction of affairs, met the king at Dymae, together with the Achaeans, who were inflamed with hatred against the Eleans, because they had disunited themselves from the rest of the Achaeans, and were incensed against the Aetolians, because they considered that they had stirred up a Roman war against them. [11] Setting out from Dymae, and uniting their forces, they passed the river Larissus, which separates the Elean from the Dymaean territory.