Britonia

Britonia was an early medieval diocese in north-western Iberia, situated in modern Galicia. Its denizens were likely speakers of Brittonic who settled on the northern coast of the Iberian Peninsula at the time of the Anglo-Saxon settlement of Britain. The name Britonia is commonly used in secondary literature to describe the settlement itself, though this use of the name is unattested in medieval sources. The name survives in multiple place-names in north-western Spain, such as in the Province of Lugo.