Question: In what year did the man speculated to be Adiva's father die?

full_context: Document 1: 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 2: 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.
Document 3: Ælfhere, Ealdorman of Mercia: Ælfhere (died in 983) was ealdorman of Mercia. His family, along with those of Æthelstan Half-King and Æthelstan Rota, rose to greatness in the middle third of the 10th century. In the reign of Edward the Martyr, Ælfhere was a leader of the anti-monastic reaction and an ally of Edward's stepmother Queen Dowager Ælfthryth. After the killing of Edward by Ælfthryth's servants in 978, Ælfhere supported the new king, Ælfthryth's son Æthelred the Unready, and was the leading nobleman in the Kingdom of England until his death in 983.
Document 4: 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.
Document 5: Anne of Bohemia: Anne of Bohemia (11 May 1366 – 7 June 1394) was Queen of England as the first wife of King Richard II. A member of the House of Luxembourg, she was the eldest daughter of Charles IV, Holy Roman Emperor and King of Bohemia, and Elizabeth of Pomerania. She died at 28 after 12 years of marriage; she was childless, and greatly mourned by her husband.
Document 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: Edward the Elder: Edward the Elder (Old English: "Eadweard cyning "; c. 874 – 17 July 924) was King of the Anglo-Saxons from 899 until his death. He became king in 899 upon the death of his father, Alfred the Great. He captured the eastern Midlands and East Anglia from the Danes in 917 and became ruler of Mercia in 918 upon the death of Æthelflæd, his sister.
Document 13: Adiva: Adiva was the first wife of Boleslaus II of Bohemia. It has been speculated that she was the progeny of Edward the Elder, King of England, and his second wife Aelfflaed, but the evidence for this is weak. Favouring the conjecture is the similarity of her name to certain Anglo-Saxon forms, and the introduction of English-influenced coinage into Bohemia. Nevertheless, since there are a handful of other possible candidates, the evidence for the hypothesis must be counted insufficient.
Document 14: 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 15: Edward the Confessor: Edward the Confessor (Old English: "Ēadƿeard Andettere" ] , Latin: "Eduardus Confessor" ] ; c. 1003 – 5 January 1066), also known as Saint Edward the Confessor, was among the last Anglo-Saxon kings of England. Usually considered the last king of the House of Wessex, he ruled from 1042 to 1066.
ground_truth: 924