Mathematician:Claudius Ptolemy

Latin name: Claudius Ptolemaeus, in Greek: Κλαύδιος Πτολεμαῖος (Klaúdios Ptolemaîos), but known generally as Ptolemy (pronounced Toll-em-ee).

Roman citizen, of either Greek or Egyptian ancestry.

Mathematician, astronomer and general all-round scientist.

Best known for being the author of several scientific works, including Almagest.

Nationality
Roman (of Greek or Egyptian origin).

History

 * Born: c 90 CE, Ptolemais Hermiou in the Thebaid
 * Died: c 168 CE, Alexandria in Egypt

Theorems

 * Ptolemy's Theorem

Books and Papers

 * c. 150: Mathematical Syntaxis, otherwise known as Almagest ("The Greatest") (on astronomy)
 * Planetary Hypotheses (on astronomy)
 * Handy Tables (on astronomy)
 * Phaseis (Risings of the Fixed Stars)
 * Geographia
 * Apotelesmatika ("Astrological Outcomes" or "Effects") or (in Latin) Tetrabiblos ("Four books") (on astrology)
 * Harmonics (on music theory)
 * Optics

Also see

 * : Chapter $5$: Eternal Triangles