The famous anthropologist Pierre-Roland Gio in his book talks about the early civilizations of Brittany. Under pressure from the Saxons, part of the ancient Celtic tribe of Britons moved from the British Isles to northwestern Gaul. The author provides a detailed description of ancient structures, ceramics, weapons and household utensils dating back to the Paleolithic era. The narrative ends with a description of the period of the conquest of Gaul by Caesar.