The man has been given names of Jesus, Eistien, Washington, a hero they called him but he was none of these. He was cursed to roam the earth forever. So after the humans killed themselves (and he does wield very, very strong magic) over their greed he brought back unicorns and Pegasus and hydras, manticores, and dragons. He combined the unicorn and Pegasus to create a new species he called the Alicorn.