Charles the Simple in the context of "Normans"

In the Middle Ages, the duke of Normandy was the ruler of the Duchy of Normandy in north-western France. The duchy arose out of a grant of land to the Viking leader Rollo by the French king Charles the Simple in 911. In 924 and again in 933, Normandy was expanded by royal grant. Rollo's male-line descendants continued to rule it until 1135, and cognatic descendants ruled it until 1204. In 1202 the French king Philip II declared Normandy a forfeited fief and by 1204 his army had conquered it. It remained a French royal province thereafter, still called the Duchy of Normandy, but only occasionally granted to a duke of the royal house as an appanage.

Despite both the 13th century loss of mainland Normandy, the renunciation of the title by Henry III of England in the Treaty of Paris (1259), and the extinction of the duchy itself in modern-day France, the monarch of the United Kingdom is regardless still often informally referred to by the title "Duke of Normandy." This is the title used whether the monarch is a king or a queen.

Rollo (Norman: Rou, Rolloun; Old Norse: Hrólfr; French: Rollon; c. 835/870 – 933), also known with his epithet, Rollo "the Walker", was a Viking who, as Count of Rouen, became the first ruler of Normandy, a region in today's northern France. He was prominent among the Vikings who besieged Paris in 885–886, and he emerged as a war leader among the Norsemen who had secured a permanent foothold on Frankish soil in the valley of the lower Seine after the Siege of Chartres in 911. Charles the Simple, king of West Francia, agreed to the Treaty of Saint-Clair-sur-Epte, which granted Rollo lands between the river Epte and the sea in exchange for Rollo agreeing to end his brigandage, swear allegiance to Charles, convert to Christianity, and pledge to defend the Seine estuary from other Viking raiders.

Rollo's life was recorded by Dudo of St. Quentin. Historians such as W. Vogel, Alexander Bugge, and Henri Prentout have debated whether Dudo's account is historically accurate, and Rollo's origin and life are heavily disputed.

The Duchy of Normandy grew out of the 911 Treaty of Saint-Clair-sur-Epte between King Charles III of West Francia and the Viking leader Rollo. The duchy was named for its inhabitants, the Normans.

From 1066 until 1204, as a result of the Norman Conquest of England, the dukes of Normandy were usually also kings of England, the only exceptions being Dukes Robert Curthose (1087–1106), Geoffrey Plantagenet (1144–1150), and Henry II (1150–1152), who became king of England in 1154.

The Sire de Bourbon or Seigneur de Bourbon, meaning Lord of Bourbon, was the title by which the rulers of the Bourbonnais were known, from 913 to 1327, and from which the cognomen of the royal House of the same name derives. Louis I, count of Clermont, the ultimate holder, was created the first "Duke of Bourbon" and made "count of La Marche" by his cousin, King Charles IV of France, in exchange for Clermont-en-Beauvaisis, thus absorbing the title.

This title dates to at least the early 10th century and Aymar[fr] de Bourbon. Aymar lived under the reign of the Carolingian overlord Charles III of France who gave to him, in the year 913, several strongholds on the river Allier, such as the castle in the medieval town of Bourbon-l'Archambault. Of Aymar's ten successors all but three took the name "Archambault". His line ended in 1200 with the death of Archambaud VII, whose granddaughter, Mathilde of Bourbon, then became the first dame de Bourbon (dame being the feminine form of seigneur/sire), as she was Archambaud's eldest living relative (the title being heritable by female family members). Mathilde's husband, Guy II of Dampierre, added Montluçon to the possessions of the Lords of Bourbon, which had expanded to the river Cher during the 11th and 12th centuries. Their son, Archambaud VIII "the Great", seigneur de Bourbon from the year 1216 to the year 1242, rose to connétable de ("the constable of ...") France, the commander-in-chief of the French military.

The siege of Chartres took place in spring 911 during the age of Viking incursions in Europe. The Viking leader, Rollo, and his men laid siege to the city of Chartres, in West Francia. But they failed to achieve their goal before the arrival, in July 911, of a relief army sent to battle them. The engagement that ensued resulted in the defeat of the Norsemen. Although, Viking raids were far from being a rare occurrence as the Frankish realms had to contend with such sudden incursions for decades, this one would prove to have everlasting consequences on European history.

Following Rollo's defeat, the King of the West Franks, Charles the Simple, granted him a territory in the northern lands of his kingdom in exchange of an oath of fealty and his religious conversion. This territory, located between the mouth of the Seine and Rouen, a city Rollo had previously raided and seized in 876, officially formed the fief known as the County of Rouen. This county, through kinship in the decades to come, would expand into what came to be known as the Duchy of Normandy.

The treaty of Saint-Clair-sur-Epte (911) is the foundational document of the Duchy of Normandy, establishing Rollo, a Norse warlord and Viking leader, as the first Duke of Normandy in exchange for his loyalty to Charles III, the king of West Francia, following the Siege of Chartres. This treaty included a land grant of farmable coastal land from Charles the Simple to Rollo in return for his fealty and protection against other Viking groups that had been regularly raiding the northern coastline. This treaty effectively changed how mainland Europe knew to resolve ongoing raids from the Vikings.

The Normans (Norman: Normaunds; French: Normands; Latin: Nortmanni/Normanni) were a population arising in the medieval Duchy of Normandy from the intermingling between Norse Viking settlers and locals of West Francia. The Norse settlements in West Francia followed a series of raids on the French northern coast mainly from what is now Denmark, although some also sailed from Norway and Sweden. These settlements were finally legitimized when Rollo, a Scandinavian Viking leader, agreed to swear fealty to King Charles III of West Francia following the siege of Chartres in 911, leading to the formation of the County of Rouen. This new fief, through kinship in the decades to come, would expand into what came to be known as the Duchy of Normandy. The Norse settlers, whom the region as well as its inhabitants were named after, adopted the language, religion, social customs and martial doctrine of the West Franks but their offspring nonetheless retained many of their traits, notably their mercenary tendencies and their fervour for adventures. The intermixing between Norse folk and native West Franks in Normandy produced an ethnic and cultural "Norman" identity in the first half of the 10th century, an identity which continued to evolve over the centuries.

The Norman dynasty had a major political, cultural and military impact on medieval Europe and the Near East. The Normans were historically famed for their martial spirit, and eventually for their Catholic piety as adherents of the Catholic orthodoxy of the Romance community. The original Norse settlers adopted the Gallo-Romance language of the Frankish land they settled, with their Old Norman dialect becoming known as Norman, Normaund or Norman French, an important literary language which is still spoken today in parts of mainland Normandy (Cotentinais and Cauchois dialects) and the nearby Channel Islands (Jèrriais and Guernésiais). The Duchy of Normandy, which arose from the Treaty of Saint-Clair-sur-Epte, was a great fief of medieval France. The Norman dukes exercised autonomous control of their holdings in Normandy, while at the same time being vassals owing fealty to the King of France, and under Richard I of Normandy (byname Richard sans Peur, meaning "Richard the Fearless"), the duchy was forged into a cohesive and formidable principality in feudal tenure.