[citation needed] Castell Meredydd is set on a ledge on a south-facing hillside.

[1] The 60 metres (200 ft) square bailey was overlooked by higher ground to the north, and despite the wall and ditch was not well defended.

[citation needed] The outcrop on which the castle stands was first fortified in the late 12th century by Meredydd Gethin.

[6] Gilbert Marshal captured Castell Meredydd in 1236 during a truce between Llywelyn the Great and King Henry III of England.

[8] Gilbert de Clare, 7th Earl of Gloucester and lord of Glamorgan, took the castle in 1266 when he overran Senghenydd.