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 of law book is that it refers its compilation to a certain Morgeneu and his son Cyvnerth. Elsewhere it is Cyvnerth ab Morgeneu who is referred to as a well-known 'jurist', for which reason this class will be distinguished here as the 'Book of Cyvnerth'. The text adopted by Aneurin Owen as the basis of his amalgam of this type of law book is the Peniarth MS. 37 (MS. U), 'not from any superiority but as being the simplest.' (c) Those which refer both to the King of Dinevwr and to the King of Aberffraw, stating expressly that of all the kings in Wales gold is payable to these two only. The King of Dinevwr, however, is mentioned first in order, and there is a special section devoted to him. One of the Dinevwr kings is also mentioned by name, viz. Rhys ab Gruffydd, sovereign of Deheubarth, who died in 1197. There is also found a section dealing with the seven bishop-houses in Dyved, one of the patrias included in the Deheubarth. This class therefore appears to represent a 'Book of Deheubarth'. Unfortunately again Aneurin Owen named them the 'Dimetian Code', that is, the code of Dyved, although there appears to be no reason why they should be confined to this particular patria, and not made to cover the whole of that Deheubarth which was held to be subject to the King of Dinevwr. The preface of this class mentions a certain Blegywryd who is described as the cleric appointed in Howel's convention at the White House to reduce the revised laws to writing. Nothing more appears to be known of this Blegywryd beyond what is