Perseus was the son of Zeus and a mortal princess Danae of Argus. Her father King Acrisius who wanted to have male child consulted the Delphi who foretold his grandson would cause his death. Danae was childless at moment and Acrisius ordered her to be imprisoned at dungeon but Zeus visited her into a form of shower of gold and impregnated her.
Fearful of his life Acrisius decided to get ride of his daughter and grandson but would not kill them outright to not cause Zeus' wrath so he cast them both to the see into a wooden chest and they sealed safely to Island of Seriphos where Danae married a fisherman named Dictys who raised Perseus to manhood.
At some time Dictys' brother Polydectes fell in love with Danae and desired to cast Perseus away so he brought Perseus to a party and made him promise to bring Medusa's head. In order to help him Athena Hermes and Hades gave him a boot with wings to fly a shield a sword and the helm of darkness.