Claudius Ptolemy was a Greek mathematician, astronomer and geographer who lived in the Egyptian city of Alexandria while under the rule of the Roman Empire. Much of medieval astronomy and ...

Claudius Ptolemy (150 AD) map drawn from Ptolemy's coordinates for a 1482 edition of his Geographia (The Ulm Edition, Leinhard Holle) Lands beyond the bounds of the known world tantalized the ...

The great cartographers, such as Claudius Ptolemy, Martin Waldseemüller, Muhammad al-Idrisi, Abraham Ortelius, and Gerardus Mercator, have left an enduring legacy in history. Their ability to ...