Eboracum over Britain. Whilst the latest datable inscription referencing "Eboracum" dates from AD237, the continuation of the settlement after this time is certain. Building work in the city continued in the fourth century under Constantine and later Count Theodosius. The locally produced Crambeck Ware pottery arrives in "Eboracum" in the fourth century – the most famous form being intricately decorated buff-yellow 'parchment ware' painted with bright shades of red. The effect of Constantine's religious policy allowed the greater development of Christianity in Roman Britain – a bishop of York named 'Eborius' is attested here and several artifacts decorated with chi-rho symbols
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