Owain ap Maredudd (or Owain ap Maredudd ap Tudur or Owen Tudor) (c. 1400 - February 2, 1461) was a Welsh soldier and courtier. He was the son of Maredudd ap Tudor (d. 1406) and Margaret ferch Dafydd. Owen was directly descended from The Lord Rhys but remembered only because of his role in founding the Tudor dynasty and for his relationship with Catherine of Valois, widow of King Henry V of England. At some point Owain anglicised his name from the Welsh Owain ap Maredudd to Owen Tudor, taking his grandfather's name for a surname rather than the more common practice of taking his father's.