"Britain" was the ancient name used by the Romans et al. to designate the British Isles. (I think from a Celtic word.) So, it preceded any history of political identification.
Pretty much yes, the Romans called Britain "Britannia". This name means "land of the Britons". Prior to that, the island was known as Albion.
They were treating the Britons as a single ethnic group, but there would have been tribes in regions that were distinct, which they soon discovered once they arrived, finding the Scots so particularly troublesome they built an expensive wall to keep them out of the southern parts they subdued.
"Britain" was the ancient name used by the Romans et al. to designate the British Isles. (I think from a Celtic word.) So, it preceded any history of political identification.
Pretty much yes, the Romans called Britain "Britannia". This name means "land of the Britons". Prior to that, the island was known as Albion.
They were treating the Britons as a single ethnic group, but there would have been tribes in regions that were distinct, which they soon discovered once they arrived, finding the Scots so particularly troublesome they built an expensive wall to keep them out of the southern parts they subdued.