Indeed, when the Welsh did rise up against Norman rule in 1136, Fitzmartin was the only Norman lord in south Wales who was able to defend his castle, in Cardigan.

BBC: St Dogmaels Abbey

During the Middle Ages, a castle was specifically a fortified structure, largely built to defend nobles against hostile intrusions.

FORBES: Castles For Sale

The castle website claims the building was commissioned by Henry VIII in about 1540 to defend the Spithead, Southampton Water and the Solent from the invasion by the Spanish Armada.

BBC: Ryde Castle Hotel partially collapses after fire