 This view, sometimes called "Atlantic-Celtic", stands against the view that the Celtic languages have their origins farther east with the Hallstatt culture.By the time of the Roman invasion of Britain the area of modern Wales had been divided among the tribes of the Deceangli, Ordovices, Cornovii, Demetae and Silures for centuries.The Roman conquest of Wales began in AD 48 and took 30 years to complete.