The author of the article substantiates the conclusion about the identity of two little-known historical characters of the same name-Demetrius, the chief of the fleet of Philip II of Macedon, who was defeated by the citizens of Byzantium in 340/339 BC (Dion. Byz. 65), and the elder brother of Antigonus the One-Eyed, who died around the same time (Plut. Dem. 2). Key words: Philip II, Dionysius of Byzantium, Byzantium, Demetrius, Antigonus the One-eyed, Plutarch. The plot of this work is connected with the dynastic history of the Antigonids, a royal house that succeeded the Argeades and for a while united under its rule vast territories in both Europe and Asia. The starting point of the study is a passage from the Voyage of the Bosporus by Dionysius of Byzantium1, a source that often does not attract the proper attention of researchers 2 (65): "Komarod is followed by a jutting, uneven beach and underwater cliffs rising out of the sea. They were called Bacchae by the ancients , from the fact that the waves around them seem to be raging in rapid motion, like bacchantes.3 When the Byzantines defeated the army of Demetrius, the general of Philip, they named the area Fermemeria (heat)4 because of the work they did, for on that day they fought the battle of the sea with great skill, 5 and with great fervor. " 6 The work was carried out within the framework of a research project supported by the grant of the Ministry of Education and Science of the Russian Federation "Polis and supra-polis structures: forms and evolution of relations in the Greco-Roman world". 1 See the latest edition of the source with its first translation into modern (Italian) language, an extensive introductory article, and a thorough commentary: [Belfiore, 2009]. Paragraphs 57 to 95 of The Bosporus Voyages have only come down to us in a Latin translation made by the French traveler Pierre Gilles (1490-1555; then all the dates in the article are BC). 2 There are no references to it at all, for example, i ... Read more