Pembroke’s history is entwined with that of its magnificent Norman castle, birthplace of Henry VII and the subject of a bitter siege by Cromwell during the Civil Wars. The town and castle stand on a limestone ridge, along which runs the busy Main Street. Pembroke was once enclosed by a fortified wall - much of which is still standing - beyond which was a natural moat. Trading vessels which used Pembroke Quay brought prosperity to the town, and merchants built fine Georgian houses in the Main Street. The town also benefited from the building of the Royal Dockyard nearby in the 19th century.