In the table in the Appendix, the area occupied by the original baileys of the castles in this list has been measured accurately by a planimeter, from the 25-in. Ordnance maps, in all cases in which that was possible.[248] This table proves that the early Norman castles were very small in area, suitable only for the personal defence of a chieftain who had only a small force at his disposal, and absolutely unsuited for a people in the tribal state of development, like the ancient Britons, or for the scheme of national defence inaugurated by Alfred and Edward. We may remark here that in not a single case is any masonry which is certainly early Norman to be found on one of these mottes; where the date can be ascertained, the stonework is invariably later than the 11th century. ABERGAVENNY (Fig. 8).--This castle, being in Monmouthshire, must be included in our list. The earliest notice of it is a document stating that Hamelin de Ballon gave the church and chapel of the castle of Abergavenny, and the land for making a _bourg_, and an oven of their own, to the Abbey of St Vincent at Le Mans.[249] The castle occupies a pointed spur at the S. end of the town, whose walls converge so as to include the castle as part of the defence. The motte has been much altered during recent years, and is crowned by a modern building; but a plan in _Coxe's Tour in Monmouthshire_, 1800, shows it in its original round form. The bailey is roughly of a pentagonal shape, covering 1 acre, and is defended by a curtain wall with mural towers and a gatehouse. The ditch on the W. and N. is much filled in and obscured by the encroachment of the town. On the E. the ground descends in a steep scarp, which merges into those of the headland on which the motte is placed.[250] [Illustration: FIG. 8. Arundel, Sussex. Abergavenny, Monmouth.]