According to a legend concerning the Mont Saint-Michel Bay, Granville and the insular quarter of Chausey were covered in the Forest of Scissy, sunken in 709.
Granville, in the heart of the land, would then become like Dinard and Saint-Malo a coastal town known as Roque de Lihou.

In 1066, William the Conqueror in his conquest of England, sought the help of the Grant family.
As a token of recognition, he awarded the lands of Roque de Lihou.
The Grants are therefore the first Lords of the town after the Vikings.
In 1143, the parish of Notre-Dame was created.
It is probable that monks from Mont-Saint-Michel went to the Priory on Lihou during the first half of the 12th century.
In 1252, in the absence of a male descendant, Jeanne de Granville married Raoul d'Argouges, Lord of Gratot.
In 1424, the criminal case of Pierre Le Maçon took place in Granville, which was then judged by the chancery of Henry VI of England in February 1425, in Paris.
In 1439, the construction of the Notre-Dame du Cap Lihou Church began.

On 26 October 1439, Sir Thomas de Scales, Seneschal of Normandy, and English officer of the Hundred Years' War, bought the Roque of Jean d'Argouges.
On order of King Henry VI of England, in order to isolate Mont Saint-Michel, the last French bridgehead into Norman territory, he had the walls of Granville built.
In 1440, the construction of the fortress began.
To further protect this city, Lord Thomas de Scales had a ditch dug between the peninsula and the mainland, so that the sea and the waters of the Boscq made the peninsula an island.

However, on 8 November 1442, by ruse, Louis d'Estouteville took over the castle since which has remained permanently in the hands of the French.
Charles VII decided to make Granville a fortified town and signed a charter in 1445 granting arms and exempting the residents of tax.
From 1450, ships were fishing at Newfoundland.
In 1470, Louis XI visited the town to ensure its loyalty in the conflict opposing the Bretons and Burgundians.
In 1492, the Jews of Spain, expelled by the Alhambra Decree, arrived in France.
A community settled in Granville, their right to trade and to lend money allowed the town to arm a large fleet.
According to a legend concerning the Mont Saint-Michel Bay, Granville and the insular quarter of Chausey were covered in the Forest of Scissy, sunken in 709. Granville, in the heart of the land, would then become like Dinard and Saint-Malo a coastal town known as Roque de Lihou.
In 1066, William the Conqueror in his conquest of England, sought the help of the Grant family. As a token of recognition, he awarded the lands of Roque de Lihou. The Grants are therefore the first Lords of the town after the Vikings. In 1143, the parish of Notre-Dame was created. It is probable that monks from Mont-Saint-Michel went to the Priory on Lihou during the first half of the 12th century. In 1252, in the absence of a male descendant, Jeanne de Granville married Raoul d'Argouges, Lord of Gratot. In 1424, the criminal case of Pierre Le Maçon took place in Granville, which was then judged by the chancery of Henry VI of England in February 1425, in Paris. In 1439, the construction of the Notre-Dame du Cap Lihou Church began.
On 26 October 1439, Sir Thomas de Scales, Seneschal of Normandy, and English officer of the Hundred Years' War, bought the Roque of Jean d'Argouges. On order of King Henry VI of England, in order to isolate Mont Saint-Michel, the last French bridgehead into Norman territory, he had the walls of Granville built. In 1440, the construction of the fortress began. To further protect this city, Lord Thomas de Scales had a ditch dug between the peninsula and the mainland, so that the sea and the waters of the Boscq made the peninsula an island.
However, on 8 November 1442, by ruse, Louis d'Estouteville took over the castle since which has remained permanently in the hands of the French. Charles VII decided to make Granville a fortified town and signed a charter in 1445 granting arms and exempting the residents of tax. From 1450, ships were fishing at Newfoundland. In 1470, Louis XI visited the town to ensure its loyalty in the conflict opposing the Bretons and Burgundians. In 1492, the Jews of Spain, expelled by the Alhambra Decree, arrived in France. A community settled in Granville, their right to trade and to lend money allowed the town to arm a large fleet.
Granville, Manche