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18GGM Margaret de Ros, born 1365 in Helmsley, Ryedale District, North Yorkshire, England, last child of 19GGP Thomas Ros, 4th Baron Ros of Helmsley, and Beatrice de Stafford; married 18GGF Reynold (or Reginald) Grey, 3rd Baron Grey of Ruthin; she died 1414 in Ruthin, Denbighshire, Wales. Their fifth child and third daughter was 17GGM Margaret Grey (c.1397-c.1426), who married 17GGF William Bonville, 1st Baron Bonville.

Arms of Grey de Ruthyn: Barry of six argent and azure in chief three torteaux
De Grey enjoyed the favour both of Richard II and Henry IV, and his chief military exploits were against the Welsh, during the rebellion of Owain Glyndŵr. Reynold de Grey was a powerful Marcher Lord of the Welsh Marches, responsible for issuing and enforcing royal demands in the Northern March, such as calling the local nobility and gentry and their men to Royal and military service. It was his dispute with Owain Glyndŵr over a piece of moorland called the common of Croisau that caused the latter’s rebellion against King Henry IV of England. Under King Richard II the case had been found in favour of Glyndŵr, but on the usurpation of King Henry IV of England Lord Grey seized the land.

De Grey was taken prisoner by Glyndŵr in January 1402, and ransomed for the sum of 10,000 marks which was paid by King Henry. In September 1400, the town of Ruthin had been razed to the ground by the Welsh in revenge for the destruction of Glyndŵr’s manor of Sycharth by Grey and his men; the castle, however, was left standing, and its inhabitants unharmed.

Grey was a member of the Council which governed England during the absence of Henry V in France in 1415; he later fought against the French in the Hundred Years War in 1420 and 1421. He had been previously a Governor of Ireland.
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