Abraham ibn Daud (Hebrew: אברהם בן דוד‎; Arabic: ابراهيم بن داود‎) was a Spanish-Jewish astronomer, historian, and philosopher; born at Córdoba, Spain about 1110; died in Toledo, Spain, according to common report, a martyr about 1180. He is sometimes known by the abbreviation Rabad I or Ravad I. His mother belonged to a family famed for its learning. Some scholars believe he is the Arabic-into-Latin translator known as “Avendauth.”