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).
... a threat to Hapsburg lands and the peace of Western Europe. In 1535 Charles won an important victory at Tunis, but in 1536 Francis I of Spain allied himself with Suleiman ...