Question: Who was the King of England from 23 April to 30 November 1016 that also led the English army in the Battle of Assandun?

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: 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 3: 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 4: Battle of Lund: The Battle of Lund, part of the Scanian War, was fought on December 4, 1676, in an area north of the city of Lund in Scania in southern Sweden, between the invading Danish army and the army of Charles XI of Sweden. The Danish had an army of about 13,000 under the personal command of 31-year-old King Christian V of Denmark, aided by General Carl von Arensdorff. The Swedish army, which numbered about 8,000, was commanded by Field Marshal Simon Grundel-Helmfelt and the 21-year-old Swedish king Charles XI. It is one of the bloodiest battles in percent of casualties on both sides ever fought on European soil.
Document 5: Great Heathen Army: The Great Viking Army or Great Danish Army, known by the Anglo-Saxons as the Great Heathen Army (OE: "mycel hæþen here"), was a coalition of Norse warriors, originating from Denmark (and likely also from Sweden and Norway) who came together under a unified command to invade the four Anglo-Saxon kingdoms that constituted England in AD 865.
Document 6: Battle of Ashdown: The Battle of Ashdown, in Berkshire (possibly the part now in Oxfordshire), took place on 8 January 871. Alfred the Great, then a prince of only 22, led the army of his brother, King Ethelred of Wessex, in a victorious battle against the invading Danes.
Document 7: Battle of Stamford Bridge: The Battle of Stamford Bridge took place at the village of Stamford Bridge, East Riding of Yorkshire, in England on 25 September 1066, between an English army under King Harold Godwinson and an invading Norwegian force led by King Harald Hardrada and the English king's brother Tostig Godwinson. After a bloody battle, both Hardrada and Tostig along with most of the Norwegians were killed. Although Harold Godwinson repelled the Norwegian invaders, his army was defeated by the Normans at Hastings less than three weeks later. The battle has traditionally been presented as symbolising the end of the Viking Age, although major Scandinavian campaigns in Britain and Ireland occurred in the following decades, such as those of King Sweyn Estrithson of Denmark in 1069–1070 and King Magnus Barefoot of Norway in 1098 and 1102–1103.
Document 8: Odda, Ealdorman of Devon: Odda, also known as Oddune, was a ninth-century ealdorman of Devon. He is known for his victory at the Battle of Cynwit in 878, where his West Saxon forces defeated a Viking army led by Ubba, brother of the Viking chiefs Ivar the Boneless and Halfdan Ragnarsson.
Document 9: 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 10: Battle of Marton: The Battle of Marton or Meretum took place on approximately 22 March 871 at a place recorded as Marton, perhaps in Wiltshire or Dorset. According to the Anglo-Saxon Chronicle, the battle took place "about two months" after a prior loss to the Danes at the Battle of Basing, in which both sides suffered heavy losses. King Æthelred of Wessex and Prince Alfred fought against the Danes, who were possibly under the leadership of King Halfdan Ragnarsson, who had commanded many of the earlier battles that year. The Chronicle tells us that the forces were split in two and that the Danes were initially put to flight, but at the end of the day and after "much slaughter" the Danes remained masters of the field. Among the fallen was Bishop Heahmund.
Document 11: Battle of Ashdown: The Battle of Ashdown, in Berkshire (possibly the part now in Oxfordshire), took place on 8 January 871. Alfred the Great, then a prince of only 22, led the army of his brother, King Ethelred of Wessex, in a victorious battle against the invading Danes.
Document 12: 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 13: Battle of Assandun: The Battle of Assandun (or Essendune) was fought between Danish and English armies on 18 October 1016. There is disagreement whether Assandun may be Ashdon near Saffron Walden in north Essex or, as long supposed, Ashingdon near Rochford in southeast Essex, England. It ended in victory for the Danes, led by Canute the Great, who triumphed over the English army led by King Edmund Ironside. The battle was the conclusion to the Danish reconquest of England.
Document 14: 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 15: 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.
ground_truth: Edmund Ironside