Sub-Roman Britain is a term derived from an archaeological label for the material culture of Great Britain in Late Antiquity. The term "Sub-Roman" was invented to describe the potsherds in sites of the 5th and 6th century, initially with an implication of decay of locally-made wares from a higher standard under the Roman Empire.It is now often used to denote a period of history; the term "post-Roman Britain" is also used for the period, mainly in non-archaeological contexts.