What was Zagereus known for?

If you mean Zagreus, in Greek Mythology he was son of Zeus (or Hades?) and Persephone; Zeus put him upon the throne and the Titans murdered him, mimicking the antics of Hera; Zagreus was the "first-born Dionysus"; Zeus recovered the child's heart and making it into a potion, fed it to his love Semele, from this drink she conceived Dionysus.