Chirk Castle (Welsh: Castell y Waun) is a Grade I listed castle located at Chirk, near Wrexham, Wales. The castle was built in 1295 by Roger Mortimer de Chirk, uncle of Roger Mortimer, 1st Earl of March as part of King Edward I's chain of fortresses across the north of Wales. It guards the entrance to the Ceiriog Valley. It was the administrative centre for the Marcher Lordship of Chirkland.The castle was bought by Thomas Myddelton in 1595 for £5,000 (approx. £11 million as of 2008).