Scaean Gate - Laomedon, father of Priam, was punished by a pestilence and a sea monster when he refused to pay the gods Apollo and Poseidon for building the walls of Troy for him. Only the sacrifice of Laomedon's daughter Hesione could relieve Troy of this punishment, until the Greek hero Heracles, to whom the king promised his divine horses, killed the monster and rescued Hesione. However, King Laomedon again refused to pay, and so Heracles returned with his men to capture Troy and killed Laomedon and all his sons except Priam.  Laomedon was buried near the Scaean Gate, and it was believed that Troy's walls would remain impregnable as long as his grave remained undisturbed.

See also:
Visual Group's Lion Gate Image
Visual Group's Scaean Gate Page