 Other sources of Welsh folklore include the 9th-century Latin historical compilation "Historia Britonum" (the History of the Britons) and Geoffrey of Monmouth's 12th-century Latin chronicle "Historia Regum Britanniae" (the History of the Kings of Britain), as well as later folklore, such as "The Welsh Fairy Book" by W. Jenkyn Thomas.Wales can claim one of the oldest unbroken literary traditions in Europe.The literary tradition of Wales stretches back to the sixth century and includes Geoffrey of Monmouth and Gerald of Wales, regarded by historian John Davies as among the finest Latin authors of the Middle Ages.