|Swallowfield, Berkshire, England|
|Grid reference||grid reference|
|Type||Fortified manor house|
Beaumys Castle was a manor in the parish of Swallowfied, given to Sir Nicholas de la Beche in 1335. De la Beche received a licence to crenellate in 1338 and produced a fortified manor house. The castle was rectangular, protected by earthworks approximately 130m by 110m across, surrounded by a water-filled moat, with the castle accessed from an entrance to the north-west.
De la Beche died, leaving the manor to his wife Margery, who in turn remarried, to Thomas Arderne. On Arderne's death in 1347, however, John de Dalton and a small group of followers broke into the castle, where they killed Michael de Poynings, an important nobleman; terrified Lionel, the son of Edward III who was staying there at the time; stole £1,000 worth of goods, and seized Margaret, whom, as a wealthy widow, was forced to marry John.
- MacKenzie, James Dixon. (1896/2009) The Castles of England: Their Story and Structure. General Books LLC. ISBN 978-1-150-51044-1.
- Mackenzie, p.170.
- Beaumys Castle Monument No. 237298, National Monuments Record, English Heritage, accessed 18 August 2012.
- Ford, David Nash (2011). "Margery Poynings (d. 1349)". Royal Berkshire History. Nash Ford Publishing. Retrieved 4 October 2011.
- Beaumys Castle, National Monuments Record, English Heritage, accessed 13 June 2011