Note 355 — Chapter XI · MILITARY ARCHITECTURE IN THE LATER MIDDLE AGES: FORTIFIED TOWNS AND CASTLES
Reading edition
This is the date proposed by Bates, Border Holds: C. H. Hartshorne (Archæol. Inst., Newcastle, vol. ii.) proposed a later date, c. 1435-40. Mr Bates’ date is more likely than the other: for neither is there any direct evidence.