Most of the remaining speakers of Celtic languages live in the British Isles, in Wales, northwest Scotland and Ireland. Until the Anglo-Saxons began settling in England in the 5th century, Celts were spread throughout Britain, but today almost all that remains of these Celts is place-names derived from early Celtic. Almost all, because we know from classical writers of the 1st century BC that the Celts of Gaul venerated watery places like lakes...