Raglan Castle is a late medieval castle located just north of the village of Raglan in the county of Monmouthshire in south east Wales. Its origins lie in the 12th century but the ruins visible today date from the 15th century and later. The peak of the power and splendour of the castle came in the 15th century and 16th centuries, as the Marches fortress of the great family of Herbert.
Its ruin came at the end of one of the longest sieges of the English Civil War. After it fell, systematic slighting of the castle was undertaken and the Great Tower was largely destroyed by mining. In the 20th century, the Dukes of Beaufort placed the castle in the care of the state. It is presently administered by Cadw.