Work on the vicus of the Roman fort at Slack, Huddersfield, by the Huddersfield and District Archaeological Society during three seasons of excavation in 2007, 2008 and 2010, covered in this volume, has led to a reconsideration of the dates of Roman occupation, taking it well into the 3rd and possibly 4th centuries AD. As on many other Roman military sites, the vicus area has had little attention and the possible continuation of the civilian area as a place of note on the Roman road has not previously been fully investigated. Radiocarbon dating and pottery analysis show convincingly that there was considerable late activity in the vicus area adjacent to the fort and the Roman road from Chester to York.