Norse Danish Influence on Normandy and Guernsey

 During the 9th century A.D., Norman invaders hailing from Scandinavia descended upon the northwestern shores of France. Settling primarily along the lower reaches of the River Seine, they bestowed upon the region its enduring moniker: Normandy, aptly named as the land of the Northmen. Through a series of conquests and raids, they gradually expanded their sway, seizing Rouen in 841 and conducting further incursions along the Seine valley up to Paris. The indigenous Franks found it challenging to stem the Norman tide, leading to a pivotal agreement in 911 between Charles the Simple, King of the West Franks, and Rollo, the Norman leader. This accord saw the King relinquishing territory around Rouen to the Normans, recognizing Rollo as Duke of Normandy in exchange for fealty. However, the Cotentin peninsula and the Channel Islands remained beyond Norman control until Rollo's successor, William Longsword, integrated them into his domain in 933. Thereafter, the Channel Islands became an integral part of the Duchy of Normandy, evidencing Norman administrative and legal influence that endured through the ages. Ecclesiastically, the islands fell under the jurisdiction of the diocese of Coutances, while legally, they constituted the domain of the Norman Dukes, who granted estates as fiefs to monasteries and nobles.