| Licenses to crenellate granted permission for a person to fortify a site. |
| Licences to crenellate were also proof of a relationship with or favour from the monarch, who was the one responsible for granting permission. |
| In 1434, King Henry V granted a licence to crenellate a wall around Alnwick, which took over fifty years to complete. |
| Further rebuilding was undertaken in 1354, when another licence to crenellate was received. |
| As one increases, the surface naturally begins to ruffle and crenellate. |
| The castle was built by the John Cockerham, the Abbot of Furness Abbey around 1327, when Edward III gave the abbey a licence to crenellate on the site. |
