The idea that he was a bard at the court of King Arthur dates back at least to the tale of "Culhwch and Olwen", perhaps a product of the 11th century. It is elaborated upon in modern English poetry, such as Tennyson's "Idylls of the King" and Charles Williams's "Taliessin Through Logres". But the historical Taliesin's career can be shown to have fallen in the last half of the 6th century, while historians who argue for Arthur's existence date his victory at Mons Badonicus in the years either side of AD 500; the "Annales Cambriae" offer the date of c. 539 for his death or disappearance in the Battle of Camlann, only a few years earlier than the date of 542 found in the "Historia Regum Britanniae". Taliesin also appears as a companion of Bran the Blessed in this era, by which time he was clearly perceived as a legendary figure who existed in many different times.