Lucius Cornelius Alexander Polyhistor (; flourished in the first half of the 1st century BC; also called
Alexander of Miletus) was a
Greek scholar who was enslaved by the
Romans during the
Mithridatic War and taken to
Rome as a tutor. After his release, he continued to live in
Italy as a Roman citizen. He was so productive a writer that he earned the surname
polyhistor (very learned). The majority of his writings are now lost, but the fragments that remain shed valuable light on antiquarian and eastern Mediterranean subjects. Among his works were historical and geographical accounts of nearly all the countries of the ancient world, and the book
Upon the Jews which excerpted many works which might otherwise be unknown.