The Tintagel slate is dedicated to an individual called Coliavus. He can be identified in the Llyfr Baglan as belonging to gen -1 as shown in the table below which has the names in the manuscript forms:
|Gen.||H2414a||LB 79-80a||LB 215a||JC 46|
|23||Adam||Adam (m. Herbert m. Peter)||Adam|
|19||Lord Herbert||Lord Herbert|
|18||Lord Henry Herbert||Lord Henry Herbert|
|17||Lord Herbert||Lord Herbert|
|12||Rol (m.) Aedaf||Rolopedaph||Rolopedaph|
Note, JC 46 was added to the table to assist the dating as it shares Brochuael with LB.
Lord Henry Herbert, of gen. 18, was the king Henry I’s chamberlain. He attempted to assasinate the royal and is likely to be the same person as Herbert of Winchester. He did have a son called Herbert who became chamberlain to Scotland’s king David I. However, the Harleian 5835 states Lord Herbert, of gen. 19, was an illegitimate son of Henry I by Nest, daughter of Rhys ap Tewdwr. This would identify him as Henry FitzRoy who died in 1158.
The LB says Lord Herbert of Cornwall was son of Godwyn, duke of Cornwall. Moreover, the Harleian 2414 describes Godwin as “iarll Kernyw”. Pen. 135 p.369 goes further and calls him “ iarll Kernyw a Dyfnaint”. Yorke mentions:
“What had a more significant impact on the history of the six West Saxon shires as an administrative grouping was Cnut’s abolition of the two ealdormanries of eastern and western Wessex and his appointment of Godwine as earl of Wessex, that is of all England south of the Thames.”.
He was the father of Harold Godwinson. The table shows Godwin’s predecessor as Alfred Aetheling, the brother of Edward the Confessor. Godwin’s father, Wulfnoth, is listed next.
The 12th C Norman poet Beroul in Tristran has a character called Godoine, described as a Cornish traitor, being killed by Tristan shooting an arrow into his eye. This appears to be a reference to Harold Godwinson although the name given is that of his father. As the above genealogy shows, Harold would have claimed Cornish ancestry. This suggests there may have been at Hastings the ironic situation of units in both the opposing forces at that battle invoking the name of Arthur! The Bayeux tapestry shows one of the Saxon banners with a red dragon, see The Bayeux tapestry and the draco standards. This could have been an assertion of Welsh ancestry, though some may argue a Danish connection.
The Tintagel slate is likely to have been a trial attempt for a plaque intended for the island chapel commemorating Coliavus. John Leland tells us the chapel was dedicated to “S. Ulette alias Uliane”.
Nicholas Orme in The Saints of Cornwall says “Perhaps this came about through Guilant being reinterpreted as Juliana, of which Juliot is a diminutive form; …”. Evidence for this claim is the fact that St. Juliot appears in the folio 122v of the Great Domesday Book as Sanguiland. The name Guiland derived from Koilbin, one of the manuscript forms for Coliavus. So we have the following sequence:
Coliavus → Koilbin → Guiland → Juliana/Juliot → Uliane/Ulette.
That Coliavus was in some way identified with Arthur, that is Paternus according to the slate, led to Juliot being misidentified with St. Julitta, the mother of St. Paternus of Avranches.
The Welsh version for Julitta is Ilid. This appears as Loth in the Historia Regum Britanniae and Llew in the Brut y Brenhinedd. Gweirydd ap Llew was Gareth of the Arthurian Romances and it is that name that appears in the above table under gen. 0.