Question: Who is the father-in-law of Cuthburh?

Knowledge 1: Cuthburh
Saint Cuthburh or Cuthburg (died) was the first Abbess of Wimborne Minster.She was the sister of Ine, King of Wessex and was married to the Northumbrian king Aldfrith. [SEP] Knowledge 2: Aldfrith of Northumbria
Aldfrith(Early Modern Irish: Flann Fína mac Ossu; Latin: "AldfridAldfridus"; died 14 December 704 or 705) was king of Northumbria from 685 until his death.He is described by early writers such as Bede, Alcuin and Stephen of Ripon as a man of great learning.Some of his works and some letters written to him survive.His reign was relatively peaceful, marred only by disputes with Bishop Wilfrid, a major figure in the early Northumbrian church.Aldfrith was born on an uncertain date to Oswiu of Northumbria and an Irish princess named Fín.Oswiu later became King of Northumbria; he died in 670 and was succeeded by his son Ecgfrith.Aldfrith was educated for a career in the church and became a scholar.However, in 685, when Ecgfrith was killed at the battle of Nechtansmere, Aldfrith was recalled to Northumbria, reportedly from the Hebridean island of Iona, and became king.In his early-8th-century account of Aldfrith's reign, Bede states that he "ably restored the shattered fortunes of the kingdom, though within smaller boundaries".His reign saw the creation of works of Hiberno-Saxon art such as the Lindisfarne Gospels and the Codex Amiatinus, and is often seen as the start of Northumbria's golden age.
Knowledge 1: Cuthburh
Saint Cuthburh or Cuthburg (died) was the first Abbess of Wimborne Minster.She was the sister of Ine, King of Wessex and was married to the Northumbrian king Aldfrith. [SEP] Knowledge 2: Barthold A. Butenschøn Sr.
Hans Barthold Andresen Butenschøn( 27 December 1877 – 28 November 1971) was a Norwegian businessperson.He was born in Kristiania as a son of Nils August Andresen Butenschøn and Hanna Butenschøn, and grandson of Nicolay Andresen.Together with Mabel Anette Plahte( 1877 – 1973, a daughter of Frithjof M. Plahte) he had the son Hans Barthold Andresen Butenschøn Jr. and was through him the father- in- law of Ragnhild Butenschøn and grandfather of Peter Butenschøn.Through his daughter Marie Claudine he was the father- in- law of Joakim Lehmkuhl, through his daughter Mabel Anette he was the father- in- law of Harald Astrup( a son of Sigurd Astrup) and through his daughter Nini Augusta he was the father- in- law of Ernst Torp.He took commerce school and agricultural school.He was hired in the family company N. A. Andresen& Co, and became a co-owner in 1910.He eventually became chief executive officer.The bank changed its name to Andresens Bank in 1913 and merged with Bergens Kreditbank in 1920.The merger was dissolved later in the 1920s.He was also a landowner, owning Nedre Skøyen farm and a lot of land in Enebakk.He chaired the board of Nydalens Compagnie from 1926, having not been a board member before that.He also chaired the supervisory council of Forsikringsselskapet Viking and Nedre Glommen salgsforening, and was a supervisory council member of Filharmonisk Selskap.He was a member of the gentlemen's club SK Fram since 1890, and was proclaimed a lifetime member in 1964.He was buried in Enebakk.
Knowledge 1: Aldfrith of Northumbria
Aldfrith(Early Modern Irish: Flann Fína mac Ossu; Latin: "AldfridAldfridus"; died 14 December 704 or 705) was king of Northumbria from 685 until his death.He is described by early writers such as Bede, Alcuin and Stephen of Ripon as a man of great learning.Some of his works and some letters written to him survive.His reign was relatively peaceful, marred only by disputes with Bishop Wilfrid, a major figure in the early Northumbrian church.Aldfrith was born on an uncertain date to Oswiu of Northumbria and an Irish princess named Fín.Oswiu later became King of Northumbria; he died in 670 and was succeeded by his son Ecgfrith.Aldfrith was educated for a career in the church and became a scholar.However, in 685, when Ecgfrith was killed at the battle of Nechtansmere, Aldfrith was recalled to Northumbria, reportedly from the Hebridean island of Iona, and became king.In his early-8th-century account of Aldfrith's reign, Bede states that he "ably restored the shattered fortunes of the kingdom, though within smaller boundaries".His reign saw the creation of works of Hiberno-Saxon art such as the Lindisfarne Gospels and the Codex Amiatinus, and is often seen as the start of Northumbria's golden age. [SEP] Knowledge 2: Barthold A. Butenschøn Sr.
Hans Barthold Andresen Butenschøn( 27 December 1877 – 28 November 1971) was a Norwegian businessperson.He was born in Kristiania as a son of Nils August Andresen Butenschøn and Hanna Butenschøn, and grandson of Nicolay Andresen.Together with Mabel Anette Plahte( 1877 – 1973, a daughter of Frithjof M. Plahte) he had the son Hans Barthold Andresen Butenschøn Jr. and was through him the father- in- law of Ragnhild Butenschøn and grandfather of Peter Butenschøn.Through his daughter Marie Claudine he was the father- in- law of Joakim Lehmkuhl, through his daughter Mabel Anette he was the father- in- law of Harald Astrup( a son of Sigurd Astrup) and through his daughter Nini Augusta he was the father- in- law of Ernst Torp.He took commerce school and agricultural school.He was hired in the family company N. A. Andresen& Co, and became a co-owner in 1910.He eventually became chief executive officer.The bank changed its name to Andresens Bank in 1913 and merged with Bergens Kreditbank in 1920.The merger was dissolved later in the 1920s.He was also a landowner, owning Nedre Skøyen farm and a lot of land in Enebakk.He chaired the board of Nydalens Compagnie from 1926, having not been a board member before that.He also chaired the supervisory council of Forsikringsselskapet Viking and Nedre Glommen salgsforening, and was a supervisory council member of Filharmonisk Selskap.He was a member of the gentlemen's club SK Fram since 1890, and was proclaimed a lifetime member in 1964.He was buried in Enebakk.

Answer: Oswiu of Northumbria