Eva verch Gruffydd ap David of Cwchwillan
- Marriage (1): Gwilym ap Gruffydd ap Heilen Lord of Penrhyn and Cwchwillan about 1340
Another name for Eva was Efa verch Griffith ap David of Cochwillan.
Source: A Genealogical and Heraldic Dictionary of the Landed Gentry of Great Britain & Ireland" by John Burke & John Bernard Burke, vol. I, London, 1847, p. 736 has:
"The eldest son [of Heilin ap Tudor and Agnes verch Bloddyn], GRIFFITH AP HEILIN, was father of GWILYM AP GRIFFITH, living 26 EDWARD III., who m. Efa, dau. of Griffith ap David, of Cochwillan, eldest son of Tudor ap Madoc, Lord of Penrhyn, in Caernarvon, (who d. about 1284,) grandson of Yarddyr ap Cynddelw, Lord of Uchaf, and had two sons, 1. Bleddyn ap Gwilym... 2. Griffith ap Gwilym, of Penrhyn"
Was Efa his wife? Or was she Gwen (i.e., swapped)? Swapping them (Eva as wife of Gruffydd ap Heilen) would bring Penrhyn and Cwchwillan into the family one generation sooner.
Source: The History of the Princes, the Lords Marcher, and the Ancient Nobility of Powys Fadog, and the Ancient Lords of Arwystli, Cedewen, and Meirionydd by J. Y. W. Lloyd, Vol. IV, London, 1884, p. 341, places Eva as the wife of Gruffydd ab Heilin, swapping her with Gwen. From that source re. Eva: "Eva, d. and heiress of Gruffydd ab David ab Tudor ab Madog of Penrhyn and Cwchwillan, son and heir of Iarddur, of Penrhyn and Cwchwillan, Lord of Llecchwedd Uchaf and Creuddyn, and Grand Forester of Snowdon."
From Welsh Biography Online (http://yba.llgc.org.uk/en/s1-GRIF-PEN-1300.html) :
"(1) GWILYM AP GRIFFITH AP HEILYN (third in descent from Tudur ab Ednyfed ), who d. c. 1370, m. (c. 1340) Eva, daughter of Griffith ap Tudur ap Madog ap Iarddur. Her father (d. c. 1310) and brother Gwilym ap Griffith of Llaniestyn, in Anglesey (d. c. 1375) were landowners of some note in Englefield and in various townships in Anglesey (Twrgarw, Penw and Caernarvonshire (Bodfeio). She was probably one of the co-heirs of her brother in 'Gafael Iarddur' in Bodfeio in 1352, and it was almost certainly this marriage which brought Cochwillan to her husband's family, together with a share of her family's lands in Anglesey. By her brother's will, dated 1375, her son, Griffith ap Gwilym (d. 1405 - see (2) below) inherited further lands in Anglesey and Caernarvonshire."
Eva married Gwilym ap Gruffydd ap Heilen Lord of Penrhyn and Cwchwillan, son of Gruffydd ap Heilen and Gwenhwyvar verch Jevan ap Gruffydd, about 1340. (Gwilym ap Gruffydd ap Heilen Lord of Penrhyn and Cwchwillan was born about 1300 and died after 1353.)
Source: Welsh Biography Online (http://yba.llgc.org.uk/en/s1-GRIF-PEN-1300.html)