The Piri Reis MapPiri Re'is, Ptolomy (2nd Century A.D.), as well as Mercator and Oronteus Finaeus, well-known 15th Century map-makers, included the traditional southern continent in their world maps, as did others. Antarctica was not discovered until the 19th Century, and it was largely unexplored until the middle of the 20th. http://sacred-texts.com/piri/index.htm