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 names the city is known in those languages). The name was then Latinized by replacing the Celtic neuter nominative ending "-on" by its Latin equivalent "-um",a common use noted also in Gaul and Lusitania. Various place names, such as Évry, Ivry, Ivrey, Ivory and Ivrac in France would all come from "*eburacon / *eburiacon"; for example: Ivry-la-Bataille (Eure, "Ebriaco" in 1023–1033), Ivry-le-Temple ("Evriacum" in 1199) Évry (Essonne, "Everiaco" in 1158), etc. The Roman conquest of Britain began in 43 AD but advance beyond the Humber did not take place until the early 70s AD. This was because the people in