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 "Eburaci", on a wooden stylus tablet from the Roman fortress of Vindolanda in what is now the modern Northumberland. During the Roman period, the name was written both "Eboracum" and "Eburacum" (in nominative form) . The name "Eboracum" comes from the Common Brittonic "Eburākon", which means "yew tree place". The word for "yew" was "*ebura" in Proto-Celtic (cf. Old Irish "ibar" "yew-tree", (older "iobhar"), , "alder buckthorn", "alder buckthorn"), combined with the proprietive suffix "*-āko(n)" "having" (cf. Welsh "-og", Gaelic "-ach") meaning "yew tree place" (cf. "efrog" in Welsh, "eabhrach/iubhrach" in Irish Gaelic and "eabhrach/iobhrach" in Scottish Gaelic, by which