Geoffrey of Monmouth
Geoffrey of Monmouth (Latin: Galfridus Monemutensis, Galfridus Arturus; Welsh: Gruffudd ap Arthur, Sieffre o Fynwy; c. 1095 – c. 1155) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur.