Harald Hardrada in the context of "Oslo"

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. 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.

Harold Godwinson (died 14 October 1066), also called Harold II, was the last crowned Anglo-Saxon king of England. Harold reigned from 6 January 1066 until his death at the Battle of Hastings on 14 October 1066, the decisive battle of the Norman Conquest. He was succeeded by William the Conqueror, the victor at Hastings.

Harold Godwinson was a member of the most powerful noble family in England, his father Godwin having been made earl of Wessex by King Cnut the Great. Harold, who served previously as earl of East Anglia, was appointed to his father's earldom on Godwin's death. After his brother-in-law, King Edward the Confessor, died childless on 5 January 1066, the Witenagemot convened and chose Harold to succeed him; he was probably the first English monarch to be crowned in Westminster Abbey. In late September, he defeated an invasion by rival claimant Harald Hardrada of Norway in the Battle of Stamford Bridge near York before marching his army back south to meet William at Hastings two weeks later, where he was killed in battle.

The Battle of Hastings was fought on 14 October 1066 between the Norman-French army of William, Duke of Normandy, and an English army under the Anglo-Saxon King Harold Godwinson, beginning the Norman Conquest of England. It took place approximately 7 mi (11 km) northwest of Hastings, close to the present-day town of Battle, East Sussex, and was a decisive Norman victory.

The background to the battle was the death of the childless King Edward the Confessor in January 1066, which set up a succession struggle between several claimants to his throne. Harold was crowned king shortly after Edward's death but faced invasions by William, his own brother Tostig, and the Norwegian king Harald Hardrada (Harold III of Norway). Hardrada and Tostig defeated a hastily gathered army of Englishmen at the Battle of Fulford on 20 September 1066. They were in turn defeated by Harold at the Battle of Stamford Bridge on 25 September. The deaths of Tostig and Hardrada at Stamford Bridge left William as Harold's only serious opponent. While Harold and his forces were recovering, William landed his invasion forces in the south of England at Pevensey on 28 September and established a beachhead for his conquest of the kingdom. Harold was forced to march south swiftly, gathering forces as he went.

The Battle of Stamford Bridge (Old English: Gefeoht æt Stanfordbrycge) took place at the village of Stamford Bridge, East Riding of Yorkshire, in England, on 25 September 1066, between an English army under King Harold Godwinson and an invading Norwegian force led by King Harald Hardrada and the English king's brother Tostig Godwinson. After a bloody battle, both Hardrada and Tostig, along with most of the Norwegians, were killed. Although Harold Godwinson repelled the Norwegian invaders, his army was defeated by the Normans at Hastings less than three weeks later.

The battle has traditionally been presented as symbolising the end of the Viking Age, although major Scandinavian campaigns in Britain and Ireland occurred in the following decades, such as those of King Sweyn Estrithson of Denmark in 1069–1070 and King Magnus Barefoot of Norway in 1098 and 1102–1103.

Magnus Olafsson (Old Norse: Magnús Óláfsson; Norwegian and Danish: Magnus Olavsson; c. 1024 – 25 October 1047), better known as Magnus the Good (Old Norse: Magnús góði; Norwegian and Danish: Magnus den gode), was King of Norway from 1035 and King of Denmark from 1042 until his death in 1047.

Magnus was an illegitimate son of Saint Olaf, and fled with his mother Alfhild when his father was dethroned in 1028. He returned to Norway in 1035 and was crowned king at the age of 11. In 1042, he was also crowned king of Denmark. Magnus ruled the two countries until 1047, when he died under unclear circumstances. After his death, his kingdom was split between Harald Hardrada in Norway and Sweyn Estridsson in Denmark.

Tostig Godwinson (c. 1029 – 25 September 1066) was an Anglo-Saxon Earl of Northumbria and brother of King Harold Godwinson. After being exiled by his brother, Tostig supported the Norwegian king Harald Hardrada's invasion of England, and was killed alongside Hardrada at the Battle of Stamford Bridge in 1066.