In Homer's Odyssey, Theoclymenus (Ancient Greek Θεοκλύμενος, "god-renowned") is an Argive prophet of the Melampodid line who flees after killing a kinsman, joins Telemachus at Pylos, and sails to Ithaca. There he reads bird-omens of Telemachus' house and Odysseus' presence, and at dinner sees a vision of the suitors' doom — which they mock until the slaughter that night.
Adapted from Wikipedia, "Theoclymenus" · CC BY-SA 4.0
I.Family
Homer and the scholia make Theoclymenus son of Polypheides (and, in some notes, Aechme), brother of Harmonides, in the prophetic house that descends from Melampus. A minority tradition (Hyginus and others) links him instead to Thestor and thus to Calchas — a fork the atlas keeps secondary to the Odyssey genealogy.
II.In the Odyssey
Fleeing Argos after a kin-killing, he finds Telemachus at Pylos and begs a place on the ship returning to Ithaca. Telemachus takes him aboard. On Ithaca he interprets a hawk omen as a sign that Telemachus will head the royal house, and he tells Penelope that Odysseus is already home in disguise — she does not believe him.
At the suitors' feast he has a second sight of their death: the hall darkens, the walls drip blood, the guests' faces turn spectral. They laugh him out of the house; that night Odysseus and Telemachus kill them. Modern discussion sometimes links his solar imagery to a real eclipse over the Ionian Islands, but the poem's point is prophetic truth ignored.
III.Identity
The atlas id theoclymenus is the Odyssey seer. He is distinct from other Melampodids and from Calchas (calchas-thestor).