Claudius Ptolemaeus (Greek: Κλαύδιος Πτολεμαίος Klaúdios Ptolemaîos; after AD 83–c.168), known in English as Ptolemy, was a Roman mathematician, astronomer, geographer and astrologer. He lived in Roman Egypt, and was probably born there in a town in the Thebaid called Ptolemais Hermiou; he died in Alexandria around 168 AD.