Orchomenos was founded by the mythological figure Minyas. His name was applied to the region's populace, the Minyans, a people claimed to have migrated south from Thessaly. The city grew extremely prosperous on the western shores of the Kopiada, and during the Bronze Age became the dominant city-state of western Boiotia and the chief rival of Thebes.

Orchomenos was noted for its great Mycenaean palace and royal Tholos tomb, the latter of which is known as the Treasury of Minyas. Later, during the Classical period, the city would build commanding fortifications. The city employed a complex hydraulic system which drained the neighboring marshes of the lake to reclaim land. The Minyans of Orchomenos were early worshippers of the Charites, or graces, to whom they built their temples. The Charitesia festival, with its competitions in poem and music, was held in the city to honor the Charites, as was the Agrionia festival of Dionysos. According to Homer, Orchomenos supplied thirty vessels among the Hellene forces in the Trojan War.

Rivalry between Orchomenos and Thebes was founded in legend. Herakles, upon his arrival in Thebes, learned that the city was paying tribute to the Minyans in the west. When the Orchomenian delegation arrived to collect payment, the hero cut away their limbs and ordered them returned to the Minyan king, Erginos. Outraged, Orchomenos declared war upon Thebes, but was defeated in battle by Heracles and the Thebans, who sacreligiously armed themselves with weapons from temples. One variation of the story claims that Erginos was killed in the battle, and Orchomenos was forced to send tribute to Thebes.

Theater seating at Orchomenos

Orchomenos joined the Boiotian League in 600 BCE, although it practiced partial autonomy through acts such the issue of coins without the league's symbol until 387. In a rare display of unity with Thebes, Orchomenos supported the failed Persian invasion of Hellas in 480. As a consequence for this behavior, Theban authority in Boiotia was subjugated by Athens. A group of Boiotian nobles retreated to Orchomenos where they established a base from which to liberate the region from Athenian influence.

Orchomenos elected against Thebes in the Corinthian War, chosing to side with the opposing city-state of Sparta between 395 and 384 BCE. Yet, the later Theban victory at the Battle of Leuctra in 371 placed Orchomenos in a compromising situation. Though Theban leader Epaminondas condemned any retaliation against the city, Thebes waited until the general was away on campaign in 364 to raze Orchomenos. The neighboring region of Phokis arrived to rebuild the city nine years following, only to have the Thebans return and demolish Orchomenos a second time in 349.

Uniquely, Orchomenos gained a final victory over Thebes with Macedonian conquest. In 338 BCE, King Philip II arrived in Boiotia to contest the unitied armies of Thebes and Athens at the Battle of Chaironeia, a plain neighoring Orchomenos. The Macedonian victory granted the northern kingdom hegemony over the Hellenic city-states, and enabled the swift destruction of Thebes later. Philip and his son Alexander would rebuild Orchomenos and its mighty defenses.

Sources: Wikipedia: Minyans Orchomenos Classic Panos: Orchomenos

Credits: Tholos Tomb, edited Source Amphitheater at Orchomenos, edited Source