Harold Harefoot
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| Rank: | 19th |
| Ruled: | November 12, 1035-March 17, 1040 |
| Predecessor: | Canute |
| Date of Birth: | 1016 |
| Place of Birth: | Denmark |
| Wife: | Never married |
| Buried: | Saint Clement Dane's Church |
| Date of Death: | March 17, 1040 |
| Parents: | Canute and Ælgifu |
Harold I Harefoot (c. 1016 - March 17, 1040) was a King of England (1037 - 1040). He was the son of King Canute of Denmark and England and Ælgifu of Northampton. He earned the name "Harefoot" for his speed and skill at hunting.
As the son of Canute and his queen Emma of Normandy, Harold's younger half-brother Harthacanute was legitimate heir to the thrones of both Denmark and England at Canute's death (1035), but Harold took effective power in England and secured recognition by Harthacanute (1036) as regent during the latter's absence in Denmark.
In opposition to his brother, Harold proclaimed himself King of England in 1037. His period of rule is associated with the blinding and death of Alfred, Emma's son by Ethelred, following Alfred's return to the kingdom (possibly in an attempt to take the throne) with his brother Edward. Harold never married, but he had an illegitimate son, Elfwine, who became a monk on the continent.
Harold died at Oxford in 1040, just as Harthacanute was preparing an invasion. He was buried at Westminster, but Harthacanute later exhumed the body, decapitated it and discarded it in a marsh.
| Preceded by: Canute |
List of British monarchs | Succeeded by: Harthacanute |