Normandy
Viking invaders arrived at the mouth of the river Seine in 911, at a time when Franks were fighting on horseback and Frankish lords were building castles. Over the next century the population of the territory ceded to the Vikings, now called Normans, adopted these customs as well as Christianity and the langue d'oïl. Norman Barons built timber castles on earthen mounds, beginning the development of motte-and-bailey castles, and great stone churches in the Romanesque style of the Franks. By 950 they were building stone keeps. The Normans were among the most travelled peoples of Europe, exposed to a wide variety of cultural influences including the Near East, some of which became incorporated in their art and architecture. They elaborated on the Early Christian basilica plan, longitudinal with side aisles and an apse, and a western facade with two towers as at the Church of Saint-Étienne at Caen begun in 1067, which formed a model for the larger English cathedrals beginning some twenty years later.
Read more about this topic: Norman Architecture