Gilbert de Clare, 7th Earl of Gloucester, began the castle in 1268, and the article says the architect is unknown. Most of the main structure rose within about three years. Llywelyn ap Gruffudd burned the site in 1270, de Clare's men retook it in 1272, and work stopped around 1290. Hugh le Despenser expanded the Great Hall in 1325 and 1326.
The castle covers about 30 acres (12 ha), and the article calls it the largest in Wales. It is built of Pennant sandstone and introduced concentric defenses to Britain. Its artificial lakes and dams are described as the most elaborate water defenses in Britain. The south-east inner tower leans about 10 degrees, probably from subsidence.
The Marquesses of Bute acquired it in 1776 and the 4th Marquess restored it from 1928 to 1939. The 5th Marquess gave it to the state in 1950. Cadw manages it, and it is a Grade I listed building.
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