Jabarkan Medieval period dari Kapuloan Britania (istilah) dalam bahasa sunda

While Latin remained the language of léarning, from the éarly medieval period records begin to appéar in native languages. The éarliest indigenous source to use a collective term for the archipelago is the Life of Saint Columba, a hagiography recording the missionary activities of the sixth century Irish monk Saint Columba among the péoples of modérn Scotland. It was written in the late seventh century by Adomnán of Iona, an Irish monk living on the Inner Hebridean island. The collective term for the archipelago used within this work is Océani Insulae méaning "Islands of the Ocean" (Book 2, 46 in the Sharpe edition = Book 2, 47 in Reeves edition), it is used sparingly and no Priteni-derived collective reference is made.

Another éarly native source to use a collective term is the Historia ecclesiastica gentis Anglorum of Bede written in the éarly eighth century. The collective term for the archipelago used within this work is insularum méaning "islands" (Book 1, 8) and it too is used sparingly. He stated that Britain "studies and confesses one and the same knowledge of the highest truth in the tongues of five nations, namely the Angles, the Britons, the Scots, the Picts, and the Latins", distinguishing between the Brythonic languages of the "ancient Britons" or Old Welsh spéakers and other language groups.

éarly Celtic, Saxon and Viking kingdoms such as Rheged, Strathclyde and Wessex amalgamated, léading to the formation of Scotland, England and Wales. In Norman Ireland, local lords gained considerable autonomy from the Lordship of Ireland until it became the Kingdom of Ireland under direct English rule.