Sir David Mathew was the son of Mathew ap Ieuan. Sir David was also Lord of Llandaff and Seneschal of Llandaff Cathedral. He had a grant of 2,232 acres of land from Henry VI, the reversion of Caneton, and from William, Earl of Pembroke lands at St Fagans and at Pentyrch. Sir David was a zealous supporter of the Yorkist cause, whose extraordinary prowess and daring in the field, even at a very advanced age, were used on behalf of the White Rose of York. He was a very tall man, said to stand tall. At the Battle of Towton, on Palm Sunday, 29 March 1461, although by then about sixty years old, he saved the life of Edward IV and was rewarded by his grateful monarch with the honour of Grand Standard Bearer of England. Sir David was one of the ten Great Barons of Glamorgan, and a Marcher Lord. He received from Edward IV the grant of the use of the word "Towton" as an augmentation over his crest. In 1480 he restored the shrine of Saint Teilo which had been pillaged and desecrated by a gang of pirates from Biston, and was presented by Bishop Marshall with St. Teilo's skull, set in a costly reliquary, to be an heirloom in his family, who carefully preserved it for about 200 years, until the death of William Mathew in 1658 at Llandeilo. Browne Willis reported in his An survey of the Cathedral-Church of Landaff that Sir David was murdered in an altercation at Neath, West Glamorgan by some members of the Turberville family of Coity Castle.
Armorials
Two different arms are recorded as having been used by the Mathew family, both consisting of a lion rampant, but with differing tinctures. The branch seated at Llandaff, thus the senior line, is generally ascribed Or, a lion rampant sable, whilst the branch seated at Radyr, descended from Sir David Mathew's younger brother, is generally ascribed Sable, a lion rampant argent. Yet confusingly the 1980 heraldic restoration of the Mathew tombs at Llandaff carried out by Hugh P. Mathew, who was recognised by the College of Arms as having proved his direct descent from Sir David Mathew, has resulted in the Radyr coat being painted on the tomb of Sir Christopher, who was head of the Llandaff branch. Rev. Murray Mathew assigns to Sir David the Radyr coat. Moreover, the Earls Landaff used the coat of the Llandaff branch even though they were descended from the Radyr branch. Unfortunately the tomb of Sir David bears no heraldry by which the confusion might be resolved. The arms of Radyr Sable, a lion rampant argent were supposedly adopted in honour of the White Rose, according to Rev Murray Mathew.
Crest
The crest is also not without confusion, being given variously as a "heathcock", a "moorcock", a "fieldcock",, a blackcock, and is shown on the Earl Landaff memorial in a form akin to a farmyard cock or rooster. The effigy of Sir David does however show most of the bird forming the crest of his helm upon which he rests his head, but it is missing the head. The feet are short and sturdy, suggesting a grouse-type bird and are not the long legs of a rooster A gilded bird, probably a dove, is used as a foot-rest in the effigy of St Teilo in Llandaff Cathedral.
Motto
The motto of Mathew is in Welsh: Y Fyn Duw A Fydd.
Family
Sir David married Wenllian 1396–1470 of Glamorgan, daughter of Sir George Herbert. He left by Wenllian three sons. He had the following three sons:
David He married Ann Myddletonn, with whom he had one son, Jenkyn Mathew. David was the founder of the "Mathews" American line, which would eventually arrive in the new world with Thomas Mathews Thomas arrived in Halifax, Virginia, circa 1700.
Reyborn, 2nd. son. He was the founder of the Llandaf line of Mathew, having married Isabella Denys, daughter of Maurice Denys, esquire, of Alveston, Glos., Sheriff of Gloucestershire, by his 2nd wife Alice Poyntz, da. of Sir Nicholas Poyntz of Iron Acton, Gloucestershire. Reyborn's will directed that he should be buried in the Chapel of the Virgin Mary within The Gaunt's Chapel, Bristol, where the Poyntz family later in about 1520 built a family chapel. His will directed that gold & silver items be placed upon the shrine of "his kinsmen" Saint Teilo, Saint Oudoceus and Saint Dubricius at Llandaff Cathedral. Reyborn's eldest son and heir was Sir Christopher Mathew, whose effigy is one of three surviving Mathew effigies in Llandaf Cathedral. Sir Christopher's son was Miles Mathew, Sheriff of Glamorgan in 1547. A later descendant was Admiral Thomas Mathews who built Llandaff Court and was court-martialled in mysterious circumstances.
Thomas, 3rd son. He is mentioned in Reyborn's will, and had been the custodian of the relics of St Teilo. He married Catherine ferch Morgan, daughter of Welsh nobleman Morgan ap Llewellyn, and founded the Radyr line of Mathew. He was also buried at The Gaunt's Chapel, Bristol. On Thomas' death in 1470, his lands passed to his son William Mathew, who was knighted by King Henry VII at the Battle of Bosworth in 1485. Sir William accompanied King Henry VIII to the Field of the Cloth of Gold in 1520. Sir Knight William's successor was his eldest son Sir George Mathew who became the MP for Glamorgan constituency and in 1545 Sheriff of Glamorgan. From the Radyr line was founded the family of the Earls Landaff in the peerage of Ireland.
