Claudius Ptolemaeus (AD 90 – c. 168), known in English as Ptolemy was a Roman citizen of Greek or Egyptian ancestry. He was a mathematician, astronomer, geographer, astrologer and a poet of a single epigram in the Greek Anthology. He lived in Egypt under the Roman Empire, and died in Alexandria around AD 168.
Ptolemy was the author of several scientific treatises, at least three of which were of continuing importance to later Islamic and European science.
There is little evidence on the subject of Ptolemy's ancestry but most scholars and historians consider it unlikely that Ptolemy was related to the royal Egyptian dynasty of the Ptolemies.