It should long ago have been recognised by historians that King Arthur, a British ruler who fought against the Saxons, if he existed at all was most likely to be Welsh. This was certainly the local tradition in Wales and was confirmed when the researchers examined another very important document called "The Llandaff Charters". This book, which was prepared by the Bishop of Llandaff in the early 13th century was presented to the pope as evidence of church ownership of lands seized by the Normans. It was based on the cathedral chartulary, a legal document recording all land grants made to the church by the local kings and nobles of Glamorgan going back to the late fifth and early sixth centuries. the Book of Llandaff provides a "who's who" of the time in question. From this it was very easy to determine that there was a King Athrwys (Welsh for Arthur), who lived at the appropriate time and whose father was called Meurig (Maurice), grandfather Tewdrig (Theoderic) and mother Onbrawst. They found the location of the site of the fabled Camelot at a hill just north of Cardiff, and the site of the famous Battle of "Mons Badonis" at a site still named on maps as "Mynydd Baidan", along the Maesteg Valley near Bridgend. Most important of all they found what is his probable grave-site on a windy hilltop called Mynydd-y-Gaer. Here there were the ruins of the old church of St Peter-super-montem, which they bought from the church commissioners. Inside it they found a memorial stone with the Latin inscription "REX ARTORIUS FILI MAURICIUS". Though not grammatically correct, this could be understood as "King Arthur son of Maurice".