Clavis enim Angliae est (Chron. Maj., Rolls Series, iii, p. 28).
See the Official Guidebook (1953).
Armitage, E.S., Early Norman Castles (1912), p. 139.
William, of Poitiers, in Scriptores Rerum Gestarum Willelmi Conquestoris, ed. Giles, (1845), pp. 108–9, 139–40.
Mediaeval Military Architecture, ii (1884), p. 12.
Official Guidebook, p. 3.
Where authenticated prehistoric pottery has recently been recovered from the outer banks by Mr P. Rahtz.
Hill-Forts of Northern France (Society of Antiquaries, 1957), pp. 63, 119.
I have to acknowledge the help in writing this note of Professor Stuart Piggott and of Mr A. J. Taylor, Deputy Chief Inspector of Ancient Monuments.
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