Geoffrey of Monmouth (1100-1155) was a Welsh cleric and one of the major figures in the development of British history and the popularity of tales of King Arthur. He is best known for his chronicle Historia Regum Britanniae ("History of the Kings of Britain"), widely popular in its day, credited uncritically well into the 16th century and translated to various other languages from its original Latin. Geoffrey wrote several works of interest, all in Latin, the language of learning and literature in Europe during the medieval period. The earliest one to appear was probably the Prophetiae Merlini...