Note 316 — Chapter XI · MILITARY ARCHITECTURE IN THE LATER MIDDLE AGES: FORTIFIED TOWNS AND CASTLES
Reading edition
Ibid., 12 Edw. II., pt. 1, m. 7. No licence for crenellation had previously been given. The licences, here and elsewhere, explain that homicide and other crimes in the close by night made walling desirable. The gates were to be closed from twilight to sunrise.