Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pembroke Castle (Welsh: Castell Penfro) is a medieval castle in Pembroke, West Wales. The first castle was established in 1093 during the Norman invasion of Wales. However its present appearance owes much to William Marshal, one of the most powerful men in 12th-Century Britain. The castle is sited on a strategic rocky promontory by Cleddau Estuary. The first fortification on the site was a Norman motte-and-bailey. It had earthen ramparts and a timber palisade.