"

PBS.  Reference provided.  The problem is, no one knows the exact or even approximate dates of the construction period.  On ""stylistic grounds"" it could date between the late 1120s to about 1160, as Dixon and Marshall point out.  Renn is an Anglo-Norman castle expert, and he suggests it was begun in the 1130s and finished in the 1140s.  That seems the most reasonable estimate.DeAragon "