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 years. Estimates suggest that over 48,000m of stone were required, largely consisting of Magnesian Limestone from the quarries nearby the Roman settlement of Calcaria (Tadcaster). There is evidence that the Emperor Hadrian visited in 122 on his way north to plan his great walled frontier. He certainly brought with him the Sixth Legion to replace the existing garrison. Emperor Septimius Severus visited Eboracum in 208 and made it his base for campaigning in Scotland. (The fortress wall was probably reconstructed during his stay and at the east angle it is possible to see this work standing almost to full height.)