Note 716 — Chapter VII · THE CASTLES OF THE NORMANS IN ENGLAND (continued 2)
Reading edition
The keep of Norwich Castle measures 100 × 95 feet; Middleham, 100 × 80; Dover, 95 × 90. These are the largest existing keeps in England, next to the Tower and Colchester. The destroyed keep of Duffield measured 99 × 93 feet; that of Bristol is believed to have been 110 × 95.