Megareus of Onchestus

In Greek heroic genealogies Megareus is presented as a king of Onchestus who in the generation of the Minos–Theseus cycle came to Megara as an ally. Sources vary on his parentage: some traditions name him son of Poseidon and Oenope (or of the eponym Onchestus), reflecting the common Greek pattern of partial divine descent for local heroes. He is placed in the narrative sequence of the Cretan war, aiding King Nisus of Megara against Minos and meeting his death in that campaign. Later local memory at Megara preserved a tomb identified as his.

Surviving source excerpts provide no detailed physical description. He is treated as a mortal/heroic king commemorated by a tomb at Megara, implying human corporeality and burial, but no attributes of dress, age, or specific heroic accoutrements are recorded in the supplied texts.

Megareus' 'abilities' in the sources are social and martial rather than supernatural: he rules as king of Onchestus, leads or brings military aid to Megara in the Cretan invasion, and fights in inter-polis war. Some genealogical traditions grant him divine parentage (son of Poseidon), which situates him within the sacralized heroic category typical of Greek local-founders but does not in the provided material indicate explicit magical powers.