Note 243 — Chapter VII · THE CASTLES OF THE NORMANS IN ENGLAND
Reading edition
The total number would be eighty-six if Burton and Aldreth were included. Burton castle is mentioned in Domesday, but there is no further trace of its existence. The castle of Alrehede or Aldreth in the island of Ely is stated by the Liber Eliensis to have been built by the Conqueror, but no remains of any kind appear to exist now. Both these castles are therefore omitted from the list.