Gwilym ap Griffith Heilyn, third in descent from Tudur ab Ednyfed, who died ca.1370, married Eva, ca.1340, daughter of Griffith ap Tudur ap Madog ap Iarddur. Her father and brother Gwilym ap Griffith of Llaniestyn, Anglesey were landowners of some note in Englefield and in various townships in Anglesey and Caernarvonshire. She was probably one of the co-heirs of her brother in 'Gafael Iarddur' in Bodfaeo, co. Caernarvon in 1352, and it was almost certainly this marriage which brought Cochwillan to her husband's family, together with the share of her family's lands in Anglesey. By her brother, Gwilym ap Griffith's will, dated 1375, her son, Griffith ap Gwilym inherited further lands in Anglesey and Caernarvonshire.
Griffith ap Gwilym (d.1405), married Generys, ca.1360, daughter and heiress of Madog ap Goronwy Fychan who was third in descent from Ednyfed Fychan through his son, Goronwy ab Ednyfed, ancestor of the Tudors. She brought to her husband lands at Gwredog in Anglesey, together with her share of the family lands at 'Gafael Goronwy ab Ednyfed', in the township of Cororion in Caernarvonshire. 'Gafael Goronwy ab Ednyfed' was the nucleus of the Penrhyn estate and the whole 'Gafael' corresponds roughly to the present Penrhyn demesne, or park. This marriage marks the first link between the Griffith family and Penrhyn, but Griffith ap Gwilym lived throughout his life in north-east Wales.[1]
Died with eldest son Bledyn.
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