Question

What was Britain called - before it was Britain

Answer 1

Prior to being called Brittania it was known as Albionium (from which we get the romantic name Albion) but those who lived on the island - that many from Gaul (modern France) believed contained spirits of the dead - would have referred to it as possibly either Breten Veur (Cornish Gaelic) or Breatainn Mhor (Scots Gaelic).

Answer 2

....................................Albionium