Established in AD 50 as a Roman military fortress, it had become a civilian settlement (vicus) with a bath house and a mansio by the 2nd century.[1] Letocetum fell into decline by the 4th century and the Romans had left by the 5th century. There have been scattered Romano-British finds in Lichfield and it is possible that a burial discovered beneath the cathedral in 1751 was Romano-British.[10] There is no evidence of what happened to Letocetum after the Romans left; however, Lichfield may have emerged as the inhabitants of Letocetum relocated during its decline. A Cair Luit Coyd ("Fort Greywood") was listed by Nennius among the 28 cities of Britain in his Historia Brittonum,[11] although these were largely historic remembrances of early Sub-Roman Britain.