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 II of Tusculum Ptolemy II of Tusculum Ptolemy II (also "Ptolemæus" or "Tolomeo") (died 1153) was the count of Tusculum and consul of the Romans ("consul Romanorum") from 1126 to his death. He was the son and successor of Ptolemy I. The younger Ptolemy entered the political scene of central Italy for the first time in 1117, when he appears as joint count with his father and is given in marriage to Bertha, illegitimate daughter of Henry V, Holy Roman Emperor. At this time, the counts of Tusculum first claimed descent through the "gentes" Julii and Octavii, a claim Ptolemy continued. The counts