Who is the prophet who was sent to the Greeks before the advent of Prophet Muhammad, peace be upon him?

Allah created every nation and sent to each a Warner and a Guide, as He Almighty said: "And there is no nation but that there has passed within it a Warner" [Fatir:24], and "And for every people is a guide" [Ar-Ra'd:7]. As for the name of the Prophet who was sent to Greece, we do not know it, and it has not been mentioned in any book or Sunnah, nor is there any benefit in knowing it. A Muslim should ask about what benefits him in this world and the Hereafter, and avoid questions that are of no benefit.