Note: Australia is generally considered to be a continental landmass, rather than an island. If however one does count Australia among the islands it, not Greenland, would be the largest in the world (unless one also considered Antarctica an island).
... - ancient Egyptian who travelled along the Red Sea to a land called Punt
Sven Hedin[?], (1865-1952), explorer
Bjarni Herjulfsson[?] - Viking discoverer of ...