Perseus kills Medusa, by cutting off her head, and the sea monster, by turning it to stone, using medusa's head.
Dionysus did not kill Perseus!
In Greek myth, Dionysus does not kill Perseus.
Perseus in Greek myth did not kill Ariadne.
No, Perseus killed Medusa.
There was no purpose for either Medusa or Perseus. Medusa was the only mortal Gordon (dreadful female creatures) whose eyes turned people to stone. That is all there was to her. She probably liked to just mind her own business. Perseus was sent to kill her and fetch her head by a king. The king wanted to get rid of him and thought he would be killed by Medusa. Perseus managed to kill her thanks to the help of the gods Zeus, Hermes and Athena.
Acrisius was killed in Larissa, by Perseus. As it was foretold by an oracle that Acrisius's daughter Danae, would have a child that would one day kill him - who turned out to be Perseus
he killed
Polydectes's true motive in sending Perseus to kill Medusa was to get rid of Perseus, hoping that Perseus would not return alive from such a dangerous quest. Polydectes was interested in Perseus's mother, Danae, but wanted Perseus out of the way.
Polydectey's believes that Perseus will turn to stone and he will be Able to marry Perseus's mom
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Because that was his "mission"
Not in Greek myth, no.