Jason of Pherae (Greek: Ἰάσων ὁ Φεραῖος) was the ruler of Thessaly during the period just before Philip II of Macedon came to power. He had succeeded his father Lycophron I of Pherae as tyrant of Pherae and was appointed tagus, or king, of Thessaly in the 370s BC and soon extended his control to much of the surrounding region. Controlling a highly trained mercenary force as well as the famous Thessalian cavalry, Jason briefly transformed Thessaly into a powerful Greek state and even spoke of invading the Persian Empire. Before writing to Philip II, Isocrates sent letters to Jason requesting that he unify Greece, as Philip later would.
The figure of Jason makes a sudden appearance in the history of classical Greece with Xenophon swiftly mentioning his name during his commentary on Theban hegemony during the 370s. From seemingly out of nowhere arose a very ambitious proto-Philip general with a hugely competent army. Xenophon quotes Jason as claiming:
‘I have men of other states as mercenaries to the number of six thousand, with whom, as I think, no city could easily contend. As for numbers,' he said, `of course as great a force might march out of some other city also; but armies made up of citizens include men who are already advanced in years and others who have not yet come to their prime. Furthermore, in every city very few men train their bodies, but among my mercenaries no one serves unless he is able to endure as severe toils as I myself’
Pherae is the English transliteration of two towns in Ancient Greece.
One (Greek: Φεραί) was a city in southeastern Thessaly. One of the oldest Thessalian cities it was located in the southeast corner of Pelasgiotis. According to Strabo, it was near Lake Boebeïs 90 stadia from Pagasae, its harbor on the Gulf of Pagasae (Geography 9.5).
In Homer Pherae was the home of King Admetus and his wife, Alcestis, (whom Heracles went into Hades to rescue), as well as their son Eumelus (who was one of the suitors of Helen and led the Achaean forces of Pherae and Iolcus in the Trojan War) (Iliad 2.711; Odyssey 4.798).
Thucydidies lists Pherae among the early Thessalian supporters of Athens at the beginning of the Peloponnesian War (History of the Peloponnesian War 2.22). Toward the end of the war Lycophron established a tyranny at Pherae. On his death his son Jason became dictator and by around 374 B.C.E. extended his rule throughout Thessaly. After Jason's assassination and that of his two successors Alexander ruled Phere with great harshness until he was killed by his wife Thebe in 359 B.C.E., and Thessaly was conquered by the Thebans. Philip of Macedon conquered Pherae in 352 B.C.E. and subjected Thessaly to Macedonian rule.