A generation later the splendidly preserved square keep which still forms its core was added, probably in the time of Richard 'Strongbow' de Clare, Earl of Pembroke and Lord of Goodrich 1148-76.
Thereafter the fortress and earldom passed to Henry III's half-brother,William de Valence, who rebuilt its defences and living quarters in the most up-to-date style.
During the Civil War, Goodrich was held successively by both sides. Sir Henry Lingen's Royalists eventually surrendered in 1646 under threats of undermining and a deadly Parliamentarian mortar. The famous 'Roaring Meg', the only surviving Civil War mortar, has returned to the castle after over 350 years.