Lewes Castle is a late 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. 11 miles east is Michelham Priory.