Medusa received help. He received a mirrored shield from Athena, gold, winged sandals from Hermes, a sword from Hephaestus and Hades's helm of invisibility. Since Medusa was the only one of the three Gorgons who was mortal, Perseus was able to slay her while looking at the reflection from the mirrored shield he received from Athena. During that time, Medusa was pregnant by Poseidon. When Perseus beheaded her, Pegasus, a winged horse, and Chrysaor, a giant wielding a golden sword, sprang from her body. Jane Ellen Harrison argues that "her potency only begins when her head is severed, and that potency
Polydectes protective of his mother and would not allow Polydectes near her. Therefore, Polydectes hatched a plot to get him out of the way. Under the pretence that he was going to marry Hippodamia, he ordered every man in Seriphos to supply him with suitable gifts. His friends were to provide horses but Perseus failed to bring any, so Polydectes announced that he wanted nothing more than the head of the Gorgon Medusa, being that Perseus had previously said he was up to a task so harsh as fetching a Gorgon's head. Perseus agreed and Polydectes told him that he could