Ibrahim ibn Yaqub
Ibrahim ibn Yaqub (Arabic: إبراهيم بن يعقوب Ibrāhīm ben Yaʿqūb al-Ṭarṭūshi or al-Ṭurṭūshī; Hebrew: אברהם בן יעקב, Avraham ben Yaʿakov; fl. 961–962) was an Andalusi Jewish traveler from Tortosa known and esteemed in the 10th century for his knowledge in science, medicine, and geography. He visited the court of the Umayyad Caliph of Córdoba, Al-Hakam II, who enlisted him to travel to several European countries, especially the Holy Roman Empire of Otto the Great.