Gwladys ferch Dafydd Gam

[5] Gwladys's father, Dafydd, was a gentleman of considerable property and a celebrated military figure, descended from the native Welsh rulers of Brycheiniog.

According to Prichard, Dafydd married Gwenllian, daughter of wealthy gentleman Gwilym ab Howel and grew up on an estate named "Petyn Gwyn" near the town of Brecon, in the parish of Garthbrengy,[2] The Oxford Dictionary of National Biography more recently reports that some genealogists claim Dafydd's wife to have been Gwladys, daughter of Gwilym ap Hywel Crach.

Roger, a gentleman of wealth, rank, and high respectability was a special friend of her father's, and would later be his companion in arms at the Battle of Agincourt.

[14] Gwladys' father Dafydd, and her husband Roger, had been part of the Welsh contingent that fought with Henry V of England; they both died at the Battle of Agincourt in France in 1415.

[13] Legends appeared in the 16th century claiming that[7] upon saving the life of Henry V at the expense of their own lives, both men were knighted by the king on the battlefield before they died.

[7] In contrast to Gwladys and Roger's allegiance to the House of Lancaster[17] and Sir William ap Thomas's daughter,[13] their three sons were staunch Yorkists during the Wars of the Roses.

[25] Other issue less consistently attributed to Gwladys and William include: Maud, Olivia, Elizabeth (who married Welsh country gentlemen, John ab Gwilym),[3] and Thomas Herbert.

[35] Gwladys and her husband William ap Thomas were patrons of Abergavenny Priory where they were both buried; their alabaster tomb and effigies can still be seen in the church of St Mary's.

[22][36][37] Gwladys was so beloved by her people that, according to legend, 3,000 knights, nobles and weeping peasantry followed her body from Coldbrook House (her son Richard's manor) to the Herbert Chapel of St. Mary's Priory Church where she was buried.