Geoffrey of Monmouth
Geoffrey of Monmouth (Latin: Galfridus Monemutensis, Galfridus Arturus, Welsh: Gruffudd ap Arthur, Sieffre o Fynwy) (c. 1100 – c. 1155) was a Welsh cleric and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle Historia Regum Britanniae ("History of the Kings of Britain"), which was widely popular in its day and was credited, uncritically, well into the 16th century, being translated into various other languages from its original Latin, but which is now considered historically unreliable.
Biography
Geoffrey was probably born some time between 1100 and 1110 in Wales or the Welsh Marches. He must have reached the age of majority by 1129, when he is recorded as witnessing a charter.
In his Historia, Geoffrey refers to himself as Galfridus Monemutensis, "Geoffrey of Monmouth", which indicates a significant connection to Monmouth, Wales, and which may refer to his birthplace. Geoffrey's works attest to some acquaintance with the place-names of the region. To contemporaries, Geoffrey was known as Galfridus Artur(us) or variants thereof. The "Arthur" in these versions of his name may indicate the name of his father, or a nickname based on Geoffrey's scholarly interests.