The Roman Map of Britain Caerwent, Monmouthshire

Ventaslurum (R&C 48) for Venta Silurum, the missing i was tucked under the preceding long s and was not seen, or the i was thought to be an erroneously placed text divider and discarded. next
Venta Silurum (AI 485₉ Iter xiv)

Caerwent (ST4690)