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 I came to Eboracum and, in 306, became the second Emperor to die there. His son Constantine was instantly proclaimed as successor by the troops based in the fortress. Although it took Constantine eighteen years to become sole ruler of the Empire, he may have retained an interest in Eboracum and the reconstruction of the south-west front of the fortress with polygonally-fronted interval towers and the two great corner towers, one of which (the Multangular Tower) still survives, is probably his work. In the colonia, Constantine's reign was a time of prosperity and a number of extensive stone town houses