where they became allies of the Picts (another Celtic tribe) and opponents of the Romans. This division of the Celts into those who experienced direct Roman rule (the Britons in England and Wales) and those who did not (the Gaels in Ireland and Scotland) may help to explain the development of two distinct branches of the Celtic group of languages. Most of their villas, baths and temples, their impressive network of roads, and the cities they founded, including Londinium (London), still exist now.