Ptolemy - New World Encyclopedia

Ptolemaic Dynasty - World History Encyclopedia

The almagest by Ptolemy

All Things Ancient Rome [2 volumes]: An Encyclopedia of the Roman World [2 volumes]: Anne Leen: Bloomsbury Academic

Muhammad ibn Mūsā al-Khwārizmī - New World Encyclopedia

Alexander the Great, Ptolemaic Coin of Alexandria (Illustration) - World History Encyclopedia

Great Books Of The Western World by Encyclopedia Britannica (Ptolemy Copernicus Kepler, Vol 16)

Ptolemy - Wikipedia

Ptolemy's geocentric model of the solar system

Ptolemy - New World Encyclopedia

Global Romans (5): The archaeology of Ptolemy's 'Golden Peninsula