Sigeferth (or Sigefrith) (died 1015) was, along with his brother

Morcar Morcar (or Morcere) (, ) (died after 1087) was the son of Ælfgār (earl of Mercia) and brother of Ēadwine. He was the earl of Northumbria from 1065 to 1066, when William the Conqueror replaced him with Copsi. Dispute with the Godwins Morcar ...

, described by the ''

Anglo-Saxon Chronicle The ''Anglo-Saxon Chronicle'' is a collection of annals in Old English, chronicling the history of the Anglo-Saxons. The original manuscript of the ''Chronicle'' was created late in the ninth century, probably in Wessex, during the reign of ...

'' as "chief

thegn In later Anglo-Saxon England, a thegn or thane (Latin minister) was an aristocrat who ranked at the third level in lay society, below the king and ealdormen. He had to be a substantial landowner. Thanage refers to the tenure by which lands were ...

of the Seven Burghs". According to the 12th century chronicle of

John of Worcester John of Worcester (died c. 1140) was an English monk and chronicler who worked at Worcester Priory. He is now usually held to be the author of the . Works John of Worcester's principal work was the (Latin for "Chronicle from Chronicles") or ...

, Sigeferth and

were the sons of one Earngrim who is otherwise unrecorded. The Seven Burghs of which they were said to be the chief men are believed to have been the Five Burghs—

Derby Derby ( ) is a City status in the United Kingdom, city and Unitary authorities of England, unitary authority area on the River Derwent, Derbyshire, River Derwent in Derbyshire, England. Derbyshire is named after Derby, which was its original co ...

Leicester Leicester ( ) is a city status in the United Kingdom, city, Unitary authorities of England, unitary authority area, and the county town of Leicestershire in the East Midlands of England. It is the largest city in the East Midlands with a popula ...

, Lincoln,

Nottingham Nottingham ( , East Midlands English, locally ) is a City status in the United Kingdom, city and Unitary authorities of England, unitary authority area in Nottinghamshire, East Midlands, England. It is located south-east of Sheffield and nor ...

and Stamford—together with Torksey and

York York is a cathedral city in North Yorkshire, England, with Roman Britain, Roman origins, sited at the confluence of the rivers River Ouse, Yorkshire, Ouse and River Foss, Foss. It has many historic buildings and other structures, such as a Yor ...

. These were among the chief towns of the northern part of the

Danelaw The Danelaw (, ; ; ) was the part of History of Anglo-Saxon England, England between the late ninth century and the Norman Conquest under Anglo-Saxon rule in which Danes (tribe), Danish laws applied. The Danelaw originated in the conquest and oc ...

. Sigeferth was murdered alongside his brother Morcar by Eadric Streona at Oxford in 1015. King Æthelred seized both Morcar's and Sigeferth's lands, and imprisoned Sigeferth's widow who was called Ealdgyth. King Edmund Ironside seized the widow and married her. Edmund redistributed some of the lands that had previously belonged to Sigeferth.These are charter
S 947
Williams, ''Æthelred'', p. 134 & note 13.

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