An inscription, discovered in Kelamantia, but coming from the amphitheatre of Brigetio, includes the term ‘forenses’. These forenses had been interpreted as inhabitants of Forum Hadriani, who had reserved places in the amphitheatre of Brigetio. The author contests this opinion and shows that the forenses are the inhabitants of one of the two civil settlements of the the camp of Brigetio, most probably of the the vicus situated 2 km west of the camp. Under Septimius Severus or Caracalla this vicus will receive the rank of a municipium.