Adelard of Bath (Latin: Adelardus Bathensis; c. 1080? – c. 1142-1152?) was a 12th-century English natural philosopher. He is known both for his original works and for translating many important Arabic and Greek scientific works of astrology, astronomy, philosophy, alchemy and mathematics into Latin from Arabic versions, which were then introduced to Western Europe. (The oldest surviving Latin translation of Euclid's Elements is a 12th-century translation by Adelard from an Arabic version.)He is known as one of the first to introduce the Arabic numeral system to Europe. He stands at the convergence of three intellectual schools: the traditional learning of French schools, the Greek culture of Southern Italy, and the Arabic science of the East.