Ystrad Peithyll (also known as Stradpeithyll and Rhosgoch Motte) is the remains of a small 12th-century motte-and-bailey castle on the River Peithyll, near Penrhyn-coch in northern Ceredigion, Wales. Built in the wake of the Norman occupation of Wales under Henry I and inhabited by a steward named Razo or Razon, it was attacked and destroyed in the rebellion led by Gruffydd ap Rhys (1113 or 1116).
- Wiles, John (29 August 2007). "Castell Ystrad Peithyll; Stradpeithyll; Rhosgoch Motte". Royal Commission on the Ancient and Historical Monuments of Wales. Retrieved 30 November 2009.
- Williams, Stephen W. (1889). The Cistercian Abbey of Strata Florida: Its History, and an Account of the Recent Excavations Made on Its Site. London: Whiting & Co. p. 26. Retrieved 30 November 2009.
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