Hector, oldest child of Priam and Hecuba, presumed heir to the throne of Troy, devoted husband of Andromache, and father of Astyanax, was the greatest Trojan hero of the Trojan War, the main defender of Troy, and a favorite of Apollo. With Apollo's help Hector killed Patroclus, the best friend of Achilles, the greatest of the Greeks, but staying on the sidelines due to a conflict with Agamemnon. When Hector killed his friend, Achilles became enraged and so agreed to join the other Greeks in fighting against the Trojans.
Achilles avenged the death of his friend by killing Hector, after which, to disgrace the Trojan prince and to let off some of his steaming madness, he dragged Hector's corpse around the grave of Patroclus three times. Priam had to go to Achilles to beg for the body of Hector so he could give him a proper burial. Despite the abuse to his corpse, the gods had kept Hector intact.
Since Hector was one of the truly virtuous pagans, Dante located Hector in Limbo, in his Inferno.
Ancient Sources for Hector: Homer, Euripides, Apollodorus, Quintus Smyrnaeus, and Pindar.