Il n'y a pas une annotation en français. Présenté est une annotation en Anglais.
Vicus established in first century along with fort, but survived as a town into the fourth century. Town walls were probably built in the third century.
http://roman-britain.co.uk/places/great_casterton.htm
http://www2.rgzm.de/transformation/unitedkingdom/smalltowns/Img11.htm