Abbot Richard of Strata Florida

Can you or any of your antiquarian readers solve me the following. It is stated in vol. i. p. 100. of Lewis Dwnn's *Heraldic Visitation into Wales, &c.*, art. "Williames of Ystradffin in the county of Caermarthen":— "William ab Thomas Goch, Esq., married Joan, daughter and sole heiress to Richard the Abbot of Strata Florida, county of Cardigan (temp. Henry VII.), son of David ab Howel of Gwydyr, North Wales." From this I naturally expected to find some connecting link between the Abbot and the ancient family of Wynn of Gwydyr, derived from Rhodri Lord of Anglesey. In their lineage, however, th…