Worcester 873-899 A motte and a Norman castle. Chester 908 A motte and a Norman castle. Bremesburh 911 Unidentified. Scærgate 913 Unidentified. Bridgenorth 913 No motte, but a Norman stone keep. Tamworth 914 A motte and a Norman castle. Stafford, N. of Sowe 914 No motte and no Norman castle. Eddisbury 915 No motte and no Norman castle. Warwick 915 A motte and a Norman castle. Cyricbyrig (Monk's Kirby) 916 No motte and no Norman castle. Weardbyrig 916 Unidentified. Runcorn 916 No motte; a mediæval castle (?). _Burhs of Edward the Elder._ Hertford, N. of Lea 913 No motte and no Norman castle. Hertford, S. of Lea 913 A motte and a Norman castle. Witham 914 No motte and no Norman castle. Buckingham, S. of Ouse 915 No motte and no Norman castle. Buckingham, N. of Ouse 915 A motte and a Norman castle. Bedford, S. of Ouse 916 No motte and no Norman castle. Maldon 917 No motte and no Norman castle. Towcester 918 A motte. Wigingamere 918 Unidentified. Huntingdon 918 A motte and a Norman castle. Colchester 918 No motte; an early Norman keep. Cledemuthan 918 Unidentified. Stamford, S. of Welland 919 No motte and no Norman castle. Nottingham, N. of Trent 919 A motte and a Norman castle. Thelwall 920 No motte and no Norman castle. Manchester 920 No castle on the ancient site. Nottingham, S. of Trent 921 No motte and no Norman castle. Bakewell (near to) 921 A motte and bailey. Out of this list of the _burhs_ of Ethelfleda and Edward, thirteen are mentioned as boroughs in Domesday Book;[61] and as we ought to subtract five from the list as unidentified, and also to reckon as one the boroughs built on two sides of the river, the whole number should be reduced to twenty-two. So that more than half the boroughs built by the children of Alfred continued to maintain their existence during the succeeding centuries, and in fact until the present day. But the others, for some reason or other, did not take root. Professor Maitland remarked that many of the boroughs of Edward's day became rotten boroughs before they were ripe;[62] and it is a proof of the difficulty of the task which the royal brethren undertook that, with the exception of Chester, none of the boroughs which they built in the north-western districts survived till Domesday. In all their boroughs, except Bakewell, the purpose of defending the great Roman roads and the main waterways is very apparent.