Ptolemy, a Greek astronomer and geographer, lived in around 85 to 165 A.D. He was born in Egypt, and he died there too. Egypt was the center of learning in those times, and it was there that Ptolemy got his education. His name Ptolemy is, in fact, an Egyptian name, while Claudius is a Roman name. This indicates that he belonged to a Greek family that lived in Egypt and that had been bestowed the honor of being a Roman citizen, an honor that was likely conferred by the Roman emperor himself. Ptolemy wrote down his work in a long, thirteen-book treatise called the Almagest. This compilation was considered very important and influential to other mathematicians and scientists in those early times. It was translated into Arabic and then Latin,