Ptolemy or optical factors and those caused by judgmental factors. He offered an obscure explanation of the sun or moon illusion (the enlarged apparent size on the horizon) based on the difficulty of looking upwards. There are several characters or items named after Ptolemy, including: [[File:Ptolemaeus - Quadripartitum, 1622 - 4658973.tif|thumb|"Quadripartitum", 1622]] [[Category:Ptolemy| ]] [[Category:100 births]] [[Category:170 deaths]] [[Category:1st-century Romans]] [[Category:2nd-century Romans]] [[Category:2nd-century philosophers]] [[Category:2nd-century poets]] [[Category:Egyptian calendar]] [[Category:Ancient Greek astrologers]] [[Category:Ancient Greek astronomers]] [[Category:Ancient Greek mathematicians]] [[Category:Ancient Greek music theorists]] [[Category:Astrological writers]] [[Category:Claudii]] [[Category:Egyptian astronomers]] [[Category:Egyptian mathematicians]] [[Category:Epigrammatists of the Greek Anthology]] [[Category:2nd-century people of Roman Egypt]] [[Category:Ancient Greek geographers]]
Ptolemy of Mauretania "‘Queen Julia Urania’". There is a possibility that Julia Urania was a member of the royal family of Emesa (modern Homs, Syria). Ptolemy married Julia Urania at an unknown date during the 1st century. She bore Ptolemy, in about 38, a daughter called Drusilla. The Kingdom of Mauretania was one of the wealthiest Roman client kingdoms, and after 24 Ptolemy continued to reign without interruption. In late 40, Caligula invited Ptolemy to Rome and welcomed him with appropriate honours. Ptolemy was confirmed as king and an ally and friend of the empire, but he was assassinated by order of Caligula.