arbiter - someone chosen to judge and decide a disputed issue; the critic was considered to be an arbiter of modern literature; the arbitrator's authority derived from the consent of the disputants; an umpire was appointed to settle the tax case.
Hippocrates was a Greek physician born in 460 BC on the  island of Cos, Greece. He became known as the founder of medicine  and was regarded as the greatest physician of hisâ¦ time. He based  his medical practice on observations and on the study of the human  body.
Hipparchus of Nicaea (/hÉªËpÉËrkÉs/; Greek: á¼µÏÏÎ±ÏÏÎ¿Ï, Hipparkhos; c. 190 â c. 120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes.