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.
[3] Margaret's father was taken prisoner by Glyndŵr in January 1402, and ransomed for the sum of 10,000 marks which was paid by King Henry.
[4] 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;[5] however, the castle was left standing, and its inhabitants unharmed.
On 7 February 1415, Margaret's father married, secondly, Joan de Astley, by whom he had another six children.
[note 2] They made their home at the Manor of Chewton Mendip,[7] in Somerset, and had several children: Margaret Grey's husband, William Bonville, K.G., first Lord Bonville, was knighted before 1417 during the campaigns in France of King Henry V. He was Knight of the Shire for Somerset in 1421, and for Devon in 1422, 1425 and 1427.