to Roman times and before, and were commonplace in medieval geography, although not based on any documented knowledge of the continent. Ptolemy's maps, which became well known in Europe during the Renaissance, did not actually depict such a continent, but they did show an Africa which had no southern oceanic boundary (and which therefore might extend all the way to the South Pole), and also raised the possibility that the Indian Ocean was entirely enclosed by land. Christian thinkers did not discount the idea that there might be land beyond the southern seas, but the issue of whether it could be inhabited was controversial. The first depiction of Terra Australis on a globe was probably on Johannes Schöner's lost 1523 globe on which Oronce Fine is thought to have based his 1531 double cordiform (heart-shaped) map of the world.Franz von Wieser, Magalhães-Strasse und Austral-Continent. Auf den Globen Johannes Schöner. Beitrage zur Geschichte der Erdkunde im xvi. Jahrhundert, Innsbruck, 1881 (reprinted Amsterdam, Meridian, 1967) On this landmass he wrote "recently discovered but not yet completely explored". The body of water beyond the tip of South America is called the "Mare Magellanicum", one of the first uses of navigator Ferdinand Magellan's name in such a context. Schöner called the continent Brasiliae Australis in his 1533 tract, Opusculum geographicum. In it, he explained: Brasilia Australis is an immense region toward Antarcticum, newly discovered but not yet fully surveyed, which extends as far as Melacha and somewhat beyond. The inhabitants of this region lead good, honest lives and are not Anthropophagi [cannibals] like other barbarian nations; they have no letters, nor do they have kings, but they venerate their elders and offer them obedience; they give the name Thomas to their children [after St Thomas the Apostle]; close to this region lies the great island of Zanzibar at 102.00 degrees and 27.30 degrees South. Mapping the southern continent Medieval period During medieval times Terra Australis was known by a different name, that being the Antipodes. First widely introduced to medieval western Europe by Isidore of Seville in his famous book the Etymologiae, the idea gained popularity over Europe, and most scholars did not question its existence, instead debating if it was habitable for other humans. It would later be included on some zonal Mappa mundi and intrigue medieval scholars for centuries. 16th century Explorers of the Age of Discovery, from the late 15th century