Brother Archibald is a Hammerite that operates in Fort Ironwood. There are several notes found in the fort that reference his name. These are mainly to do with the undead outside the fort.[1][2] The first note is found on the door into the fort's graveyard telling everyone that there are zombies outside and to keep the door shut.[3] This character is never seen in the Thief franchise.
Brother Severence reveals that a man soon to be buried before the zombies took over was a Pagan sympathizer.[4]