Lewes Castle is an impressive 11th century stone motte and bailey fortress, founded by William de Warenne. In the early 12th century, Hamelin de Plantagenet founded the stone castle, when adding a flint-built hall, on top of the western motte. Unusually built with two mottes, they both supported shell keeps but only part of one survives, flanked by two 13th century semi-octagonal towers, which offer a fine view of the 1264 battle site. In 2001, minor excavations of Brack Mount found flint foundations and surviving to its original depth, a chalk-lined well. In-between the mottes, fragments of the curtain wall curve around the large inner bailey and the remains of a Norman round-headed arched gatehouse, is defended a mighty 14th century barbican, with a machicolated parapet between two corbelled cylindrical corner turrets. Below, on the edge of town is The Mount and Lewes Priory Great Gate and 11 miles east is Michelham Priory.