An Inventory of the Historical Monuments in City of York
… after a very brief historical resume, first the two castles are described and then the city defences, following … to the W. of the fortress. In 10689 William I built two castles to the S.E. of the city, one on each bank of the … recessed below a tall arch as at Nottingham and Tonbridge Castles and that the crenellated towers, of at least three …
