British Museum stuff I ve removed In the British Museum there is a genealogy in a manuscript of the Cottonian Collection showing a lineage of Gruffydd ap Cynan It shows he is the father of Owain Gwynedd and the grandfather to Madawc another spelling for Madoc Also in the same collection is a Latin manuscript Vita Griffini Regis The life of King Gruffydd that says Gruffydd is the son of Cynan ab Iago and father to Owain Gwynedd and Owain s son found unknown lands Earlier I removed This manuscript as talked about in the Cottonian Collection has a date on it of 1477 First there are quite a few Madocs Madogs Madawcs etc so genealogies are of not much use here Secondly why are we claiming that the manuscript says this without a link to it There is an annotation that says Vita Griffini filii Conani regis Venedotiae vel Northwalliae Thelwello jurisperito Latine versa ad finem carmina reperiuntur Meredithi de Madoco filio Oweni Gwynnedd et ejus navigatione ad terras incognitas Wallice Vixit Meredithus iste circa An 1477 Note that this is not a date on the manuscript We need a reliable source that has actually read the manuscript as the annotation fails as an RD as clearly does Deacon Until a reliable source reads and comments on anything in it that might have to do with Madoc this doesn t belong here