Earlier research had suggested that the walls were from a fort built over exising Vicus or Village, circa 160. then abandoned C. 196. More current research indicates that the fortifications are for the town alone, and that it was not a fort..
See: http://roman-britain.co.uk/places/bravonium.htm
Archaeological Report:
http://htt.herefordshire.gov.uk/docs/HA341_SHE19117_BRANOGENIUMLeintwardineCMPFINALVERSION.pdf