A licence to crenellate mansum infra manerium suum was granted by Edward II.
In medieval times no one could “crenellate” a building without special licence from his supreme lord.
early 14c., from French créneler, from crénelé (12c.); see crenel. Sometimes also crenellate; the double -l- seems to be from a presumed Latin *crenella as a diminutive of crena. Related: Crenelated (1823), also crenellated; crenellation (1849). Earlier formes of the past participle adjective included carneled.