In Greek mythology, Polydamas (Ancient Greek: Πολυδάμας) was Hector's lieutenant and night-born comrade in the Iliad — son of the Trojan elder Panthous (and Phrontis), far wiser in counsel than Hector was with the spear. He repeatedly urged caution against Greek portents and after Patroclus' death; Hector overrules him, with fatal results. Distinct from historical Thessalian and Macedonian men of the same name.
Adapted from Wikipedia, "Polydamas (mythology)" · CC BY-SA 4.0
I.Counsel in the Iliad
Homer says Polydamas and Hector were born the same night. In Book 12 he reads the omen of an eagle and snake and urges retreat; Hector presses the wall attack anyway. In Book 13 Hector does accept his advice to regroup. After Achilles returns to battle (Book 18), Polydamas advises the Trojans to withdraw into the city; Hector refuses, and Achilles' slaughter ends in Hector's own death.
II.Battle and later fate
Polydamas fights as well as advises: he kills Prothoënor and others, and Apollo saves him from Meges' blow. Homer does not fix his end. Dictys has Ajax the Greater kill him about Memnon's body; another tradition has him survive with Antenor's household to found Padua in Italy. In Quintus of Smyrna he even urges giving Helen back — a counsel Paris brands cowardice.