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Afraid of getting killed by his future grandson, King Acrisius locked up his daughter, Danae in a tall tower, so she would never be able to have children thus King Acrisius could rule his kingdom for as long as he wants. One day, a shower of gold came through the window and it turned out to be Zeus, a mighty god, who thought Danae was beautiful. Months later, Danae gave birth to a demi-god son, Perseus. Perseus was the son of Zeus, a god, and Danae, a mortal princess making Perseus a powerful demi-god. Perseus is considered a Greek hero as he did many acts to be granted this name. Perseus's destiny was to complete an impossible quest that Polydectes had sent him on. He must decapitate the head of Medusa and bring it back to Polydectes. With the help of Hermes and Athena, Perseus was armed with a shiny shield that he used to kill Medusa without directly looking at her so he wouldn't turn into stone. On his way back, he saw Andromeda tied to a rock in the middke of the water to soon be eaten by a sea monster. Perseus, being heroic, went to save Andromeda in exchange of her hand in marriage. Her parents agreed but once Perseus saved Andromeda, they turned on their words. As a result he used Medusa's head to kill them so he could be with Andromeda. Once he returned,  Perseus saw that Polydectes was behaving badly so he turned him into stone as well. Later on, Perseus did accidently kill his grandfather with a discus so as recognition of his heroism, Perseus gained ruler of Argos. 
        This myth of Perseus has a strong lesson that no matter what you do or how much you delay something, you cannot avoid or alter your destiny.