Caerphilly Castle is a medieval fortification in southern Wales, which was built by Gilbert de Clare in the 13th century. Gilbert (also known as ‘Gilbert the Red’ or ‘The Red Knight’ due to his flaming red hair and fiery temper in battle) was a powerful English nobleman who held lordship to over 200 manors in southern Wales. Caerphilly is the second largest castle in Britain, and is thought to have the most extensive water defenses of any castle due to being surrounded by an extensive network of artificial lakes.
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Cardiff Castle is a medieval castle and Victorian Gothic revival mansion which was originally commissioned by William the Conquerer in the 11th century. It formed the heart of the medieval town of Cardiff, and still stands in the city center of the largest city, and capital of Wales. During WWII extensive air-raid shelters were tunneled in the outer walls of the castle, and could hold over 1800 people.