Bremenium is an ancient Roman fort (castrum) located at Rochester, Northumberland, England. The fort is one of the defensive structures built along Dere Street, a Roman road running from York to Corbridge and onwards to Melrose. Significantly the fort is a long way north of Hadrian's Wall. It was one of the last forts north of Hadrian's wall to remain occupied until the 270s. The fort's name, Bremenium, is mentioned in the Ravenna Cosmography, the Antonine Itinerary and Ptolemy's Geographia.