North Germanic peoples
Vikings were also active in Francia. Some of these Vikings would sail through the Strait of Gibraltar and pillage the coasts of the Mediterranean Sea. In the early 10th century, a group of Vikings under the leadership of Rollo settled in Rouen, France, and established the Duchy of Normandy. The descendants of these Vikings, known as the "Normans", would in the 11th century conquer England, Southern Italy, and North Africa, and play a leading role in launching the Crusades. Sub-groups of the Normans include Anglo-Normans, Scoto-Normans, Cambro-Normans, Hiberno-Normans and Italo-Normans.
History of Normandy
The first Viking raids began between 790 and 800 on the coasts of western France. Several coastal areas were lost during the reign of Louis the Pious (814–840). The incursions in 841 caused severe damage to Rouen and Jumièges. The Viking attackers sought to capture the treasures stored at monasteries - easy prey considering the helplessness of the monks to defend themselves. An expedition in 845 went up the Seine and reached Paris. The raids took place primarily in the summers, the Vikings spending the winters in Scandinavia.