A programme of excavations on and around the keep of Pevensey Castle established that the fort wall of the late Roman "Saxon Shore" fort was constructed AD 280-300, very possibly during the usurpation of Allectus. A deep sequence of "dark earth" built up against the inside of the Roman fort wall during the Roman and early medieval periods, before and after the establishment of William I's castle after 1066. A substantial stone keep and probably the...