the lycée léonin (greek: "λεόντειο λύκειο") is a non-profit private school in athens, greece. it was founded in 1838 and belongs to the catholic church. since 1907 it is run by the community of the marist brothers ("frères maristes"), a group of catholic monks dedicated to education. the school has campuses in nea smyrni and patissia and is directed by a community of six marist brothers that reside in athens.