Multiple choice general knowledge culture Medusa was killed by : Poseidon Perseus Theseus Jason Reveal answer Fill a bubble to check yourself B Correct answer Explanation Perseus slew the Gorgon Medusa by using his polished shield to see her reflection and avoid her petrifying gaze, then beheaded her while she slept. Poseidon was Medusa's lover and the sea god, Theseus slew the Minotaur, and Jason led the Argonauts.