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.
Viking Age
In 838, a small Viking fleet entered the River Liffey in eastern Ireland. The Vikings set up a base, which the Irish called a longphort. This longphort eventually became Dublin. After this interaction, the Irish experienced Viking forces for about 40 years. The Vikings also established longphorts in Cork, Limerick, Waterford, and Wexford. The Vikings could sail through on the main river and branch off into different areas of the country.