Which Greek hero killed the Trojan prince Polydorus?

The Greek hero who killed the Trojan prince Polydorus was Achilles. In the Iliad, Polydorus is the youngest son of King Priam and is known for his extraordinary speed. His mother is Hecuba in Homer’s account, although later traditions vary in their details about his parentage and fate.

During the fighting, Polydorus runs across the battlefield. Achilles sees him and strikes him with a spear, killing him. The death enrages Polydorus’ brother Hector, who attacks Achilles, but Achilles’ attention soon turns to the broader battle and the struggle around Patroclus.

Polydorus should not be confused with Patroclus, Achilles’ companion, or with other Trojan and Greek figures who bear similar names. Later versions of the Trojan War story tell different stories about Polydorus, including traditions in which he is killed after Troy’s fall by the Greek warrior Neoptolemus. For the Iliad-based question, however, Achilles is the single canonical answer.