It's Perseus not Persus and he is considered to be the first legendary hero in Greek mythology, as Dementia44 said he defeated Medusa and saved Andromeda from the sea monster (that's what he's mostly known for)
btw, he's also the only hero in Greek mythology who lived a long life :)
Well, Pegasus was born from Medusa's blood when Perseus decapitated her. Pegasus was tamed by Athena and given to Perseus to save Andromeda, but this is only a late addition to the story of Perseus, who flew on his own with the sandals loaned him by Hermes.
Very famous demi-god hero. He was the son of Zeus. Like most heroes, he has a list of great feats to his name, so I would have to whip out a greek mythology book to tell you ALL of them, although I believe that most people recognize him as "the guy who defeated Medusa".
