索姆河
In the late 3rd century AD, barbarian raids devastated Normandy. Coastal settlements were raided by Saxon pirates. Christianity also began to enter the area during this period. In 406, Germanic tribes began invading from the east, while the Saxons subjugated the Norman coast. As early as 487, the area between the River Somme and the River Loire came under the control of the Frankish lord Clovis.