The Mabinogion

In the twelfth and thirteenth centuries there arose into general notoriety in Europe, a body of “Romance,” which in various forms retained its popularity till the Reformation. In it the plot, the incidents, the characters, were almost wholly those of Chivalry, that bond which united the warriors of France, Spain, and Italy, with those of pure Teutonic descent, and embraced more or less firmly all the nations of Europe, excepting only the Slavonic races, not yet risen to power, and the Celts, who had fallen from it. It is not difficult to account for this latter omission. The Celts, driven from the plains into the mountains and islands, preserved their liberty, and hated their oppressors with fierce, and not causeless, hatred. A proud and free people, isolated both in country and language, were not likely to adopt customs which implied brotherhood with their foes.