Mont Saint-Michel is an island commune in Normandy, France. It is located approximately one kilometre off the country's northwestern coast, at the mouth of the Couesnon River near Avranches. 247 acres in size, the island has a population of 44.The island has held strategic fortifications since ancient times, and since the eighth century AD has been the seat of the monastery from which it draws its name. The structural composition of the town exemplifies the feudal society that constructed it. On top God, the abbey and monastery, below this the Great halls, then stores and housing, and at the bottom, outside the walls, fishermen and farmers' housing.One of France's most recognisable landmarks, Mont Saint-Michel and its bay are part of the UNESCO list of World Heritage Sitesand more than 3 million people visit it each year.Mont Saint-Michel was used in the sixth and seventh centuries as an Armorican stronghold of Gallo-Roman culture and power until it was ransacked by the Franks, thus ending the trans-channel culture that had stood since the departure of the Romans in AD 460. From roughly the fifth to the eighth century, Mont Saint-Michel belonged to the territory of Neustria, and in the early ninth century was an important place in the marches of Neustria.Before the construction of the first monastic establishment in the 8th century, the island was called Mont Tombe. According to legend, the Archangel Michael appeared in 708 to St. Aubert, the bishop of Avranches, and instructed him to build a church on the rocky islet. Aubert repeatedly ignored the angel's instruction until Michael burned a hole in the bishop's skull with his finger.Unable to defend his kingdom against the assaults of the Vikings, the king of the Franks agreed to grant the Cotentin peninsula and the Avranchin, including Mont-Saint-Michel, to the Bretons in the 867 Treaty of Compiègne. This marked the beginning of the brief period of Breton possession of the Mont. In fact, these lands and Mont Saint-Michel were never really included in the duchy of Brittany and remained independent bishoprics from the newly created Breton archbishopric of Dol. When Rollo confirmed Franco as archbishop of Rouen, these traditional dependences of the Rouen archbishopric were retained in it.