Eboracum workshops growing up outside the fortress to supply the needs of the 5,000 troops garrisoned there. Production included military pottery until the mid-3rd century, military tile kilns have been found in the Aldwark-Peasholme Green area, glassworking at Coppergate, metalworks and leatherworks producing military equipment in Tanner Row. In the Roman period, Eboracum was the major manufacturing centre for Whitby Jet. Known as "gagates" in Latin, it was used from the early 3rd century as material for jewelry and was exported from here throughout Britain and into Europe. Examples found in York take the form of rings, bracelets, necklaces, and pendants
Eboracum are known. Additionally, a small bone plaque from an inhumation grave bore the phrase SOROR AVE VIVAS IN DEO ('Hail sister may you live in God'). Changes in the layout of both the fort and "colonia" occurred in the late fourth century AD, suggested as representing a social change in the domestic lives of the military garrison here whereby they might have lived in smaller family groups with wives, children or other civilians. The rediscovery and modern understanding of Eboracum began in the 17th century. Several prominent figures have been involved in this process. Martin Lister was the first to