According to Ptolemy, there was a "polis" called Rigodunum belonging to the Brigantes near the position of Castleshaw. Rigodunum means "royal fort". Although it has been suggested that Castleshaw is the location of the Brigantine settlement, there is no evidence to support this. Stamps on two tegulae, produced at the Roman tilery at Grimescar Wood near Huddersfield, suggest the fortlet was supplied by the Cohors III "Bracaraugustanorum" from Pannonia, maybe even garrisoned by them at one stage. Similar stamps have been found in the forts at Manchester, Slack, and Ebchester, indicating these forts were linked.