Onomarchus

Onomarchus (Ancient Greek: Ὀνόμαρχος) was general of the Phocians in the Third Sacred War, brother of Philomelus and son of Theotimus. After his brother's death he became commander of the Phocians and pursued a warmongering policy until his final defeat.

Onomarchus commanded a division of the Phocian army under his brother, Philomelus, in the action at Tithorea, in which Philomelus perished. After the battle Onomarchus gathered the remains of the Phocian army and retreated to Delphi. An assembly of the people was held, in which Onomarchus strongly urged the prosecution of the war — in opposition to the counsels of the more moderate party.

In the winter of 354 / 353 BC, the Phocians decided to make Onomarchus supreme commander, in place of Philomelus. As far as the funding of his campaign was concerned, Onomarchus went a step further than his brother and predecessor, who had 'borrowed' from the sacred treasures of Delphi, keeping, however, scrupulous records. He actually confiscated the property of all those states who were opposed to Phocis and made full use of the accumulated wealth of the shrine. Using the treasures of Delphi he was able to assemble and maintain a large body of mercenary troops, in addition to bribing many of the hostile states, allowing him to influence the Thessalians to abandon their allies and take up a neutral position. Thus, disencumbered from his most dangerous antagonists, he was more than a match for his remaining foes.

Onomarchus' campaigning began in 353 BC. He invaded Locris, took the town of Thronium, compelled Amphissa to surrender, ravaged the Dorian Tetrapolis, and finally turned his arms against Boeotia — where he took Orchomenus and laid siege to Chaeronea — but was compelled to retreat without effecting anything more.

Following the siege of Chaeronea, his assistance was requested by , a tyrant of Pherae who was being attacked by Philip II of Macedon. At first Onomarchus sent his brother Phayllus into Thessaly with an army of 7000 men, but they were defeated by Philip's armies. Onomarchus then marched with his entire force to support Lycophron, defeated Philip in two successive battles, and drove him out of Thessaly.

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