Question: Ealdgyth, circa 992 – after 1016, modern English Edith may have been the name of the wife of Sigeferth son of Earngrim, thegn of the Seven Burghs, and later was King of England from 23 April to 30 November 1016, Edmund II, usually known as who?

full_context: Document 1: Eadred: Eadred (also Edred) (923 – 23 November 955) was King of the English from 946 until his death. He was the son of Edward the Elder and his third wife Eadgifu of Kent, and a grandson of Alfred the Great. Eadred came to the throne following the assassination of his older brother, Edmund I. The chief achievement of his reign was to bring the Kingdom of Northumbria under total English control, which occurred with the defeat and expulsion of Eric Bloodaxe in 954. Eadred died at the age of 32 having never married, and was succeeded by his 15-year-old nephew, Eadwig.
Document 2: Edmund Ætheling: Edmund Ætheling ( ;  1015–17 – possibly 1046, certainly by 1054) was a member of the royal House of Wessex as the son of Edmund Ironside, who briefly ruled as King of England between April and November 1016. He fought the Danish Vikings under Cnut the Great, but following the Danish victory at the Battle of Assandun in October, it was agreed that Ironside would rule Wessex, while Cnut took Mercia and probably Northumbria. In November 1016, Ironside died and Cnut became King of all England.
Document 3: Æthelfrith of Mercia: Æthelfrith (fl. 880s – c. 904/915) was an ealdorman of southern Mercia, who flourished in the last two decades of the ninth century and the first decade of the tenth century. His father is unknown. He was married to Æthelgyth, daughter of Æthelwulf; Æthelwulf is unidentified, but a possible candidate is King Alfred the Great's brother-in-law, the ealdorman of the Gaini who died in 901. Æthelfrith was father to four ealdormen: Æthelstan Half-King (East Anglia), Ælfstan (Mercia), Æthelwald (Kent), and Eadric (Hampshire).
Document 4: Ealdgyth (floruit 1015–1016): Ealdgyth (circa 992 – after 1016), modern English Edith may have been the name of the wife of Sigeferth son of Earngrim, thegn of the Seven Burghs, and later of King Edmund Ironside. She was probably the mother of Edmund's sons Edward the Exile and Edmund Ætheling.
Document 5: Ealdgyth, daughter of Earl Ælfgar: Ealdgyth ("fl. c". 1057–1066), also Aldgyth or in modern English, Edith, was a daughter of Ælfgar, Earl of Mercia, the wife of Gruffudd ap Llywelyn (d. 1063), ruler of all Wales, and later the wife and queen consort of Harold Godwineson, king of England in 1066. She was described by William of Jumièges as a considerable beauty.
Document 6: Edmund Ironside: Edmund II (died 30 November 1016), usually known as Edmund Ironside, was King of England from 23 April to 30 November 1016. He was the son of King Æthelred the Unready and his first wife, Ælfgifu of York. Edmund's reign was marred by a war he had inherited from his father, his cognomen "Ironside" was given to him "because of his valour" in resisting the Danish invasion led by Cnut the Great.
Document 7: Sigeferth (died 1015): Sigeferth (or Sigefrith) (died 1015) was, along with his brother Morcar, described by the "Anglo-Saxon Chronicle" as "chief thegn of the Seven Burghs".
Document 8: Edward the Exile: Edward the Exile (1016 – 19 April 1057), also called "Edward Ætheling", was the son of King Edmund Ironside and of Ealdgyth. He spent most of his life in exile in the Kingdom of Hungary following the defeat of his father by Canute the Great.
Document 9: Battle of Brentford (1016): The Battle of Brentford (1016) was fought in 1016 some time between 9 May (the approximate date Canute landed at Greenwich) and 18 October (the date of the later Battle of Ashingdon) between the English led by Edmund Ironside and the Danes led by Canute. It was one of a series of battles fought between Edmund and Canute, ultimately resulting in the lands held by Edmund's father Ethelred the Unready being divided between the two. Edmund was victorious in this particular battle, but ultimately failed to defend the lands inherited from his father.
Document 10: Ælfgar, Earl of Mercia: Ælfgar (died c. 1060) was the son of Leofric, Earl of Mercia, by his famous mother Godgifu (Lady Godiva). He succeeded to his father's title and responsibilities on the latter's death in 1057. He gained the additional title of Earl of East Anglia, but also was exiled for a time. Through the first marriage of his daughter he would become father-in-law of the Welsh king Gruffydd ap Llywelyn; a few years after his death, his daughter would become a widow and marry English King Harold.
Document 11: Edith the Fair: Edith the Fair (Old English: "Ealdgȳð Swann hnesce" , "Edyth the Gentle Swan"; c. 1025 – c. 1086), also known as Edith Swanneck, was the first wife of King Harold Godwinson. "Swanneck" (or Swan-Neck) comes from the folk etymology which made her in Old English as "swann hnecca", "swan neck", which was actually most likely a corrupted form of "swann hnesce, ""Gentle Swan"" ". She is sometimes confused with Ealdgyth, daughter of Earl Ælfgar of Mercia, who was queen during Harold's reign.
Document 12: Emma of Normandy: Emma of Normandy (c. 985 – 6 March 1052) was a queen consort of England, Denmark and Norway. She was the daughter of Richard I, Duke of Normandy, and his second wife, Gunnora. Through her marriages to Æthelred the Unready (1002-1016) and Cnut the Great (1017-1035), she became the Queen Consort of England, Denmark, and Norway. She was the mother of three sons, Edward the Confessor, Alfred, and Harthacnut, as well as two daughters, Goda of England, and Gunhilda of Denmark. Even after her husbands' deaths Emma remained in the public eye, and continued to participate actively in politics. She 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.
Document 13: Æthelred the Unready: Æthelred II, also dubbed the Unready (Old English: Æþelræd, ] ), (  966 – 23 April 1016) was King of the English (978–1013 and 1014–1016). He was the son of King Edgar the Peaceful and Queen Ælfthryth and was around 12 years old when his half-brother Edward the Martyr was murdered on 18 March 978. Although Æthelred was not personally suspected of participation, the murder was committed at Corfe Castle by his attendants, making it more difficult for the new king to rally the nation against the military raids by Danes, especially as the legend of St Edward the Martyr grew.
Document 14: Eadric, Ealdorman of Wessex: Eadric (fl. 942–949) was a tenth-century ealdorman of Wessex. He was the youngest of four sons of Æthelfrith, an ealdorman in Mercia, and his wife Æthelgyth. From 946 until his death in 949 Eadric was the second most senior ealdorman in England, surpassed only by his brother Æthelstan Half-King.
Document 15: Ealhswith: Ealhswith or Ealswitha (died 5 December 902) was the wife of King Alfred the Great. Her father was a Mercian nobleman, Æthelred Mucel, Ealdorman of the Gaini, which is thought to be an old Mercian tribal group. Her mother was Eadburh, a member of the Mercian royal family, and according to the historian Cyril Hart she was a descendant of King Coenwulf of Mercia. She is commemorated as a saint in the Christian East and the West on July 20.
ground_truth: Edmund Ironside