Harold Harefoot in the context of "Harthacnut"

Emma of Normandy (referred to as Ælfgifu in royal documents; c. 984 – 6 March 1052) was a Norman-born noblewoman who became the English, Danish, and Norwegian Queen through her marriages to the Anglo-Saxon King Æthelred the Unready and the Danish King Cnut the Great. A daughter of the Norman ruler Richard the Fearless and Gunnor, she was Queen of England during her marriage to King Æthelred from 1002 to 1016, except during a brief interruption in 1013–14 when the Danish King Sweyn Forkbeard occupied the English throne. Æthelred died in 1016, and Emma married Sweyn's son Cnut. As Cnut's wife, she was Queen of England from their marriage in 1017, Queen of Denmark from 1018, and Queen of Norway from 1028 until Cnut died in 1035.

After Cnut's death, Emma continued to participate in politics during the reigns of her sons by each husband, Harthacnut and Edward the Confessor. In 1035 when her second husband Cnut died and was succeeded by their son Harthacnut, who was in Denmark at the time, Emma was designated to act as his regent until his return, which she did in rivalry with Harold Harefoot. Emma is the central figure within the Encomium Emmae Reginae, a critical source for the history of early-11th-century English politics. As Catherine Karkov notes, Emma is one of the most visually represented early medieval queens.

The Danish House of Knýtlinga (English: "House of Cnut's Descendants") was a ruling royal house in Middle Age Scandinavia and England. Its most famous king was Cnut the Great, who gave his name to this dynasty. Other notable members were Cnut's father Sweyn Forkbeard, grandfather Harald Bluetooth, and sons Harthacnut, Harold Harefoot, and Svein Knutsson. It has also been called the House of Canute, the House of Denmark, the House of Gorm, or the Jelling dynasty.

Under Harald Bluetooth's rule, he is said on a Jelling rune stone to have unified the territory that comprises modern-day Denmark under his rule, as well as Norway. The latter claim is more tenuous, as he most likely only had periodic and indirect power over parts of modern-day Norway. Under the House of Knýtlinga, early state formation in Denmark occurred.

Ælfhelm (died 1006) was the ealdorman of Northumbria, in practice southern Northumbria (the area around York), from about 994 until his death. An ealdorman (or earl) was a senior nobleman who governed a province—a shire or group of shires—on behalf of the king. Ælfhelm's powerful and wealthy family came from Mercia, a territory and former kingdom incorporating most of central England, and he achieved his position despite being an outsider. Ælfhelm first appears in charters as dux ("ealdorman") in about 994.

Most of Ælfhelm's subsequent historical appearances record him as a witness to charters, although one notable exception is the will of his brother, Wulfric Spot. According to a 12th-century tradition, Ælfhelm was murdered and his sons blinded in 1006, by Eadric Streona with the connivance of King (Æthelred II). Ælfhelm's daughter, Ælfgifu, married Cnut the Great, King of England between 1016 and 1035, as a result of which Ælfhelm became the grandfather of future English king Harold Harefoot.

Ælfgifu of Northampton (Old Norse: Álfífa; c. 990 – after 1036) was the first wife of Cnut the Great, King of England and Denmark, and mother of Harold Harefoot, King of England. She was regent of Norway from 1030 to 1035.

The House of Godwin (Old English: Godƿine) was the house consisting of the Anglo-Saxon family who were one of the leading noble families in England during the last fifty years before the Norman Conquest. Its most famous member was Harold Godwinson, King of England for nine months in 1066.

The founder of the family's greatness, Earl Godwin, was raised from comparative obscurity by King Cnut and given the Earldom of Wessex c. 1018–1019. He retained his position during the reigns of Cnut's sons Harold Harefoot and Harthacnut, and consolidated it when King Edward the Confessor conferred earldoms on Sweyn and Harold, Godwin's two eldest sons by his Danish wife Gytha.