Anderida is an ancient Roman fort at Pevensey, near Eastbourne in Sussex, England, built about A.D. 300 as part of a scheme of land-defense against the Saxon pirates; repaired, probably by the great Stilicho, about A.D. 400; and after the Norman Conquest utilized by William the Conqueror for a Norman castle, and then later as a defensive emplacement in World War II. Its massive Roman enceinte still stands but little damaged.