History of the Normans and Their Realms

Between the tenth and twelfth centuries, Norman rulers built power in three distinct settings: the duchy, a territory ruled by a duke, around the lower Seine in northern France; the English kingdom after 1066; and lordships in southern Italy and the island of Sicily. Each developed through a different route. Normandy grew from a grant to a Viking leader; William’s invasion replaced England’s king and much of its landholding elite; in Italy, separate groups first served local rulers before building territories over decades.

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The making of Normandy

In 911, Charles the Simple, king of the western Frankish kingdom that preceded France, granted land around Rouen to Rollo, a Viking leader, to help defend the Seine approaches. The grant ran from the Epte River toward the sea. Rollo’s descendants enlarged the territory through the tenth century, while the ruling family entered the Christian and Frankish society already established there. By the early eleventh century, Norman dukes relied on local landholders, churches and monastic communities as well as connections to Scandinavia.

William became duke in 1035, while still a child, and spent his early rule securing his position against rival nobles. His duchy was the base for his 1066 campaign across the Channel. England and Normandy came under one ruler, while each remained governed through its own institutions and people.

Conquest and rule in England

Edward the Confessor’s death in January 1066 left the succession contested. Harold Godwinson was crowned the next day, while William of Normandy asserted a rival claim to the throne. In September, Harold defeated the invading Norwegian king Harald Hardrada at Stamford Bridge, then marched south to face William. On 14 October at Hastings, on England’s southern coast, William’s forces defeated the English army and Harold was killed. William was crowned at Westminster on Christmas Day, but military victory did not end resistance. In the north, rebels retook York in 1069. During the ensuing northern campaign of 1069–70, the Anglo-Saxon Chronicle says William marched north, despoiling and laying waste the shire. The devastation was part of the effort to suppress resistance across northern England.

Castles secured strategic places, and grants of estates gave William’s followers land and local power. Many English landholders lost their holdings, while the new rulers continued to use shires, the kingdom’s counties, and sheriffs, local royal officials, alongside taxation and written orders. William ordered a survey in 1085; in 1086 officials gathered information about who held land, its uses and resources, and how holdings had changed since 1066. They checked and reorganized the material into several documents for fiscal and political purposes. The Domesday process recorded estates and resources for royal government, not a count of every inhabitant. Its records show how new landholders used an existing administrative framework to assess the kingdom.

Norman lordships in southern Italy and Sicily

Norman warriors entered southern Italy as soldiers employed by competing local rulers. In 1030, Sergius IV, duke of Naples, gave Rainulf Drengot his sister in marriage and made him count of Aversa, a new territory between Naples and Capua. Marriage and a land grant turned military service into a local base. Other Norman families followed separate paths. The Hautevilles, a Norman family, built power in Apulia and Calabria; Robert Guiscard gained papal recognition as duke in 1059, and Bari, the main Byzantine (Eastern Roman) stronghold in southern Italy, surrendered after a long siege in 1071.

Sicily required a separate campaign. Robert and his brother Roger began operations there in 1060–61, but the island was not fully conquered until Noto, in the southeast, surrendered in 1091. Palermo fell in 1072 and became the island’s main royal centre. Greek-speaking Christians and Arabic-speaking Muslims remained part of the population, and Greek, Arabic and Latin traditions continued to matter under Norman rulers.

Roger II, son of Count Roger I, joined the island and mainland lordships under his authority and was crowned king in Palermo in 1130. Rival popes disputed the new title; after Roger’s forces captured Pope Innocent II in 1139, the pope confirmed his kingdom. Royal rule now brought several territories under one crown, while their local histories and populations continued to shape the realm.

Dynasties and political change

William the Conqueror’s death in 1087 divided his territories: Robert Curthose became duke of Normandy, while William Rufus took the English crown. Henry I reunited England and Normandy after defeating Robert at Tinchebray in 1106. Henry I had designated his daughter Matilda as heir, and his barons swore to uphold her claim. After Henry died in 1135, his nephew Stephen hurried to England and secured the crown; Matilda later invaded to press her claim, beginning a civil war. When Matilda’s son Henry II became king in 1154, his descent from the Norman line connected him to earlier rulers. His lands in England and France also formed a wider Angevin realm, named for the territories centred on Anjou, a county in western France.

In Sicily, Roger II was followed by William I and William II. William II’s death in 1189 brought a contested succession. Tancred claimed the throne, while Constance, Roger II’s daughter and wife of the German emperor Henry VI of the Hohenstaufen dynasty, had a dynastic claim. Henry conquered the kingdom in 1194. A new ruling family took power, while royal offices, church estates and local communities continued to shape life in the former Norman kingdom.