thumb|upright=1.6|Location of major events during the Norman Conquest in 1066
The Norman Conquest of England (or the Conquest) was an 11th-century invasion by an army made up of thousands of Norman, French, Flemish, and Breton troops, all led by the Duke of Normandy, later styled William the Conqueror.
William's claim to the English throne derived from his familial relationship with the childless Anglo-Saxon king Edward the Confessor, who may have encouraged William's hopes for the throne. Edward died in January 1066 and was succeeded by his brother-in-law Harold Godwinson. Another claimant for the throne, the Norwegian king Harald Hardrada invaded northern England in September 1066 and was victorious at the Battle of Fulford on 20 September, but Godwinson's army defeated and killed Hardrada at the Battle of Stamford Bridge on 25 September. Three days later on 28 September, William's invasion force of thousands of men and hundreds of ships landed at Pevensey in Sussex in southern England. Harold marched south to oppose him, leaving a significant portion of his army in the north. Harold's army confronted William's invaders on 14 October at the Battle of Hastings. William's force defeated Harold, who was killed in the engagement, and William became king.
Although William's main rivals were gone, he still faced rebellions over the following years and was not secure on the English throne until after 1072. The lands of the resisting English elite were confiscated; some of the elite fled into exile. To control his new kingdom, William granted lands to his followers and built castles commanding military strong points throughout the land. Under his authority, the Domesday Book, a manuscript record of the "Great Survey" of much of England and parts of Wales, was completed by 1086. Other effects of the conquest included the court and government, the introduction of a dialect of French as the language of the elites, and changes in the composition of the upper classes, as William enfeoffed lands to be held directly from the king. More gradual changes affected the agricultural classes and village life: the main change appears to have been the formal abolition of slavery, which may or may not have been linked to the invasion. There was little alteration in the structure of government because the new Norman administrators took over many of the forms of Anglo-Saxon government.
Origins
thumb|13th-century depiction of [[Rollo (top) and his descendants William I Longsword and Richard I of Normandy|upright|right]]
In 911, the Carolingian French ruler Charles the Simple allowed a group of Vikings under their leader Rollo to settle in Normandy as part of the Treaty of Saint-Clair-sur-Epte. In exchange for the land, the Norsemen under Rollo were expected to provide protection along the coast against further Viking invaders. Their settlement proved successful, and the Vikings in the region became known as the "Northmen" from which "Normandy" and "Normans" are derived. The Normans quickly adopted the local culture as they became assimilated by the French, renouncing Norse paganism and converting to Christianity. They adopted the Old French language of their new home and added features from their own Old Norse language, transforming it into the Norman language. They intermarried with the local population and used the territory granted to them as a base to extend the frontiers of the duchy westward, annexing territory including the Bessin, the Cotentin Peninsula and Avranches.
In 1002, English king Æthelred the Unready married Emma of Normandy, the sister of Richard II, Duke of Normandy. Their son Edward the Confessor, who spent many years in exile in Normandy, succeeded to the English throne in 1042. This led to the establishment of a powerful Norman interest in English politics, as Edward drew heavily on his former hosts for support, bringing in Norman courtiers, soldiers, and clerics and appointing them to positions of power, particularly in the Church. Childless and embroiled in conflict with the formidable Godwin, Earl of Wessex, and his sons, Edward may also have encouraged William of Normandy's ambitions for the English throne.
When King Edward died at the beginning of 1066, the lack of a clear heir led to a disputed succession in which several contenders laid claim to the throne of England. Edward's immediate successor was the Earl of Wessex, Harold Godwinson, the richest and most powerful of the English aristocrats. Harold was elected king by the Witenagemot of England and crowned by the Archbishop of York, Ealdred, although Norman propaganda claimed the ceremony was performed by Stigand, the uncanonically elected Archbishop of Canterbury. Harold was immediately challenged by two powerful neighbouring rulers. William claimed that he had been promised the throne by King Edward and that Harold had sworn agreement to this; King Harald III of Norway, commonly known as Harald Hardrada, also contested the succession. His claim to the throne was based on an agreement between his predecessor, Magnus the Good, and the earlier English king Harthacnut, whereby if either died without an heir, the other would inherit both England and Norway. William and Harald at once set about assembling troops and ships to invade England.
Tostig's raids and the Norwegian invasion
In early 1066, Harold's exiled brother, Tostig Godwinson, raided southeastern England with a fleet he had recruited in Flanders, later joined by other ships from Orkney. Threatened by Harold's fleet, Tostig moved north and raided in East Anglia and Lincolnshire, but he was driven back to his ships by the brothers Edwin, Earl of Mercia, and Morcar, Earl of Northumbria. Deserted by most of his followers, Tostig withdrew to Scotland, where he spent the summer recruiting fresh forces. was proclaimed king by the Witenagemot, with the support of Earls Edwin and Morcar, Stigand, the Archbishop of Canterbury, and Ealdred, the Archbishop of York. William therefore advanced, marching around the coast of Kent to London. He defeated an English force that attacked him at Southwark, but being unable to storm London Bridge, he sought to reach the capital by a more circuitous route.
William moved up the Thames valley to cross the river at Wallingford, Berkshire; while there he received the submission of Stigand. He then travelled north-east along the Chilterns, before advancing towards London from the north-west, fighting further engagements against forces from the city. Having failed to muster an effective military response, Edgar's leading supporters lost their nerve, and the English leaders surrendered to William at Berkhamsted, Hertfordshire. William was acclaimed King of England and crowned by Ealdred on 25 December 1066, in Westminster Abbey. King William attempted to conciliate the remaining English nobility by confirming Morcar, Edwin, and Waltheof, Earl of Northumbria, in their lands as well as giving some land to Edgar Ætheling. William remained in England until March 1067, when he returned to Normandy with English prisoners, including Stigand, Morcar, Edwin, Edgar Ætheling, and Waltheof.
<span class="anchor" id=1></span> English resistance
First rebellions
Despite the submission of the English nobles, resistance continued for several years. The Shropshire landowner Eadric the Wild, in alliance with the Welsh rulers of Gwynedd and Powys, raised a revolt in western Mercia, fighting Norman forces based in Hereford. In May, William's wife Matilda was crowned queen at Westminster, an important symbol of William's growing international stature. led a rising in Northumbria, which had not yet been occupied by the Normans. These rebellions rapidly collapsed as William moved against them, building castles and installing garrisons as he had already done in the south. Edwin and Morcar again submitted, while Gospatric fled to Scotland, as did Edgar the Ætheling and his family, who may have been involved in these revolts. Meanwhile, Harold's sons, who had taken refuge in Ireland, raided Somerset, Devon and Cornwall from the sea.
Revolts of 1069
The remains of [[Baile Hill, the second motte-and-bailey castle built by William the Conqueror in York, on the west bank of the River Ouse|thumb|upright=1.5|left]]
Early in 1069 the newly installed Norman Earl of Northumbria, Robert de Comines, and several hundred soldiers accompanying him were massacred at Durham. The Northumbrian rebellion was joined by Edgar, Gospatric, Siward Barn and other rebels who had taken refuge in Scotland. The castellan of York, Robert fitz Richard, was defeated and killed, and the rebels besieged the Norman castle at York. William hurried north with an army, defeated the rebels outside York and pursued them into the city, massacring the inhabitants and bringing the revolt to an end. He built a second castle at York, strengthened Norman forces in Northumbria and then returned south. A subsequent local uprising was crushed by the garrison of York. In August or September 1069 a large fleet sent by Sweyn II of Denmark arrived off the coast of England, sparking a new wave of rebellions across the country. After abortive raids in the south, the Danes joined forces with a new Northumbrian uprising, which was also joined by Edgar, Gospatric and the other exiles from Scotland as well as Waltheof. The combined Danish and English forces defeated the Norman garrison at York, seized the castles and took control of Northumbria, although a raid into Lincolnshire led by Edgar was defeated by the Norman garrison of Lincoln.
At the same time resistance flared up again in western Mercia, where the forces of Eadric the Wild, together with his Welsh allies and rebel forces from Cheshire and Shropshire, attacked the castle at Shrewsbury. In the southwest, rebels from Devon and Cornwall attacked the Norman garrison at Exeter but were repulsed by the defenders and scattered by a Norman relief force under Count Brian. Rebels from Dorset, Somerset and neighbouring areas besieged Montacute Castle but were defeated by a Norman army gathered from London, Winchester and Salisbury under Geoffrey of Coutances. The see of York had become vacant following the death of Ealdred in September 1069. Both sees were filled by men loyal to William: Lanfranc, abbot of William's foundation at Caen, received Canterbury while Thomas of Bayeux, one of William's chaplains, was installed at York. Some other bishoprics and abbeys received new bishops and abbots, and William confiscated some of the wealth of the English monasteries which had served as repositories for the assets of the native nobles.
Danish troubles
Coin of Sweyn II of Denmark|thumb|right
In 1070 Sweyn II arrived to take personal command of his fleet and renounced the earlier agreement to withdraw, sending troops into the Fens to join forces with English rebels led by Hereward the Wake, at that time based on the Isle of Ely. Sweyn accepted a payment of danegeld from William and returned home. After the departure of the Danes, the Fenland rebels remained at large, protected by the marshes, and early in 1071 there was a final outbreak of rebel activity in the area. Edwin and Morcar again turned against William, and although Edwin was quickly betrayed and killed, Morcar reached Ely, where he and Hereward were joined by exiled rebels who had sailed from Scotland. William arrived with an army and a fleet to finish off this last pocket of resistance. After some costly failures, the Normans managed to construct a pontoon to reach the Isle of Ely, defeated the rebels at the bridgehead and stormed the island, marking the effective end of English resistance. Morcar was imprisoned for the rest of his life; Hereward was pardoned and had his lands returned to him.
Last resistance
William faced difficulties in his continental possessions in 1071, but in 1072 he returned to England and marched north to confront King Malcolm III of Scotland.