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?

Context paragraphs:
Gordon-Cumming baronets: The Cumming-Gordon, later Gordon-Cumming Baronetcy, of Altyre near Forres, is a title in the Baronetage of the United Kingdom.  It was created on 27 May 1804 for Alexander Cumming-Gordon, formerly Member of Parliament for Inverness Burghs.  The Cumyn or Cumming family had been settled in Scotland since the 12th century.  One member of the family, John II Comyn, Lord of Badenoch, married Eleanor, sister of King John of Scotland.  Their son John III Comyn, Lord of Badenoch, known as the "Red Comyn", was a claimant to the Scottish throne through his mother.  A later member of the family, Robert Cumming, 13th of Altyre, married Lucy, daughter of Sir Ludovic Gordon of Gordonstoun.  Their great-grandson was the first Baronet, who assumed the additional surname of Gordon on succeeding to the Gordon of Gordonstoun estates.  The second Baronet sat as Member of Parliament for Elgin Burghs.  He changed the family surname from Cumming-Gordon to Gordon-Cumming.  The fourth Baronet is best known as a central figure in the Royal Baccarat Scandal.

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.

Bolesław I the Brave: Bolesław I the Brave (Polish: "Bolesław I Chrobry"    , Czech: "Boleslav Chrabrý" ; 967 – 17 June 1025), less often known as Bolesław I the Great (Polish: "Bolesław I Wielki" ), was Duke of Poland from 992 to 1025, and the first King of Poland in 1025.  As Boleslav IV, he was also Duke of Bohemia between 1002 and 1003.  He was the son of Mieszko I of Poland by his wife, Dobrawa of Bohemia.  According to a scholarly theory, Bolesław ruled Lesser Poland already during the last years of his father's reign.  Mieszko I, who died in 992, divided Poland among his sons, but Bolesław expelled his father's last wife, Oda of Haldensleben, and his half-brothers and reunited Poland between 992 and 995.

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.

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.

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.

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".

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.

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.

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.

Supporting paragraphs: Ealdgyth (floruit 1015–1016) Edmund Ironside
Answer: Edmund Ironside