Question: Who is Archduchess Isabella Clara Of Austria's father-in-law?

Knowledge 1: Archduchess Isabella Clara of Austria
"Not to be confused with Isabella Clara Eugenia, sovereign of the Netherlands."Isabella Clara of Austria (12 August 1629 – 24 February 1685), was a Duchess consort of Mantua, Montferrat, Nevers (until 1659), Mayenne (until 1654) and Rethel (until 1659) by marriage to Charles II, Duke of Mantua and Montferrat.During 1665–1671 she was Regent of the Duchies of Mantua and Montferrat on behalf of her minor son.Accused of marrying her lover without Imperial consent, she was forced to take the veil as a nun and imprisoned at the Ursuline monastery of Mantua until her death. [SEP] Knowledge 2: Charles II, Duke of Mantua and Montferrat
Charles Gonzaga, Duke of Mantua and Montferrat (31 October 1629 – 14 August 1665) was the son of Charles of Gonzaga-Nevers (+ 1631) of Rethel, Nevers, Mantua and Montferrat, and Maria Gonzaga.He followed his grandfather Charles I, Duke of Mantua in 1637 as ruler of these lands, the first 10 years under regency of his mother Duchess Maria.On 22 March 1657 Charles II receives the appointment as Sosai Cesareo in Italy and Imperial Vicar.Charles sold the Duchies of Nevers and Rethel in 1659 to Cardinal Jules Mazarin, the factual Regent of France, and they became part of France.On 7 November 1649 Charles II married Isabella Clara of Austria (12 August 1629 – 24 February 1665), a daughter of Leopold V, Archduke of Austria, and thus into the imperial family.The marriage was an act of diplomacy and they had only one child, his successor Ferdinand Charles, Duke of Mantua and Montferrat (1652–1708).The relationship between husband and wife effectively ended, and Charles continued a relationship with a noblewoman Margherita della Rovere, and also had affairs with men including the castrato Atto Melani.In his book "The Last Medici" Harold Acton records that his death occurred in the midst of lascivious intercourse.Charles tried to revive the tradition of his family as patrons of the arts and to rebuild his family's art collection, which had been largely sold off by his forebears.He appointed in 1657 the Flemish painter and printmaker Daniel van den Dyck as his official court painter, architect, surveyor of his building program and engineer for stage designs for the theatre.After van den Dyck's death he appointed on 4 April 1663 another Flemish painter called Frans Geffels as his new court painter.
Knowledge 1: Charles II, Duke of Mantua and Montferrat
Charles Gonzaga, Duke of Mantua and Montferrat (31 October 1629 – 14 August 1665) was the son of Charles of Gonzaga-Nevers (+ 1631) of Rethel, Nevers, Mantua and Montferrat, and Maria Gonzaga.He followed his grandfather Charles I, Duke of Mantua in 1637 as ruler of these lands, the first 10 years under regency of his mother Duchess Maria.On 22 March 1657 Charles II receives the appointment as Sosai Cesareo in Italy and Imperial Vicar.Charles sold the Duchies of Nevers and Rethel in 1659 to Cardinal Jules Mazarin, the factual Regent of France, and they became part of France.On 7 November 1649 Charles II married Isabella Clara of Austria (12 August 1629 – 24 February 1665), a daughter of Leopold V, Archduke of Austria, and thus into the imperial family.The marriage was an act of diplomacy and they had only one child, his successor Ferdinand Charles, Duke of Mantua and Montferrat (1652–1708).The relationship between husband and wife effectively ended, and Charles continued a relationship with a noblewoman Margherita della Rovere, and also had affairs with men including the castrato Atto Melani.In his book "The Last Medici" Harold Acton records that his death occurred in the midst of lascivious intercourse.Charles tried to revive the tradition of his family as patrons of the arts and to rebuild his family's art collection, which had been largely sold off by his forebears.He appointed in 1657 the Flemish painter and printmaker Daniel van den Dyck as his official court painter, architect, surveyor of his building program and engineer for stage designs for the theatre.After van den Dyck's death he appointed on 4 April 1663 another Flemish painter called Frans Geffels as his new court painter. [SEP] Knowledge 2: Archduchess Maria Carolina of Austria (1740–1741)
Archduchess Maria Carolina of Austria (Maria Carolina Ernestina Antonia Johanna Josefa; 12 January 1740 – 25 January 1741), was the third child and daughter of Archduchess Maria Theresa of Austria, later Holy Roman Empress and Duke Francis of Lorraine.
Knowledge 1: Archduchess Isabella Clara of Austria
"Not to be confused with Isabella Clara Eugenia, sovereign of the Netherlands."Isabella Clara of Austria (12 August 1629 – 24 February 1685), was a Duchess consort of Mantua, Montferrat, Nevers (until 1659), Mayenne (until 1654) and Rethel (until 1659) by marriage to Charles II, Duke of Mantua and Montferrat.During 1665–1671 she was Regent of the Duchies of Mantua and Montferrat on behalf of her minor son.Accused of marrying her lover without Imperial consent, she was forced to take the veil as a nun and imprisoned at the Ursuline monastery of Mantua until her death. [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: Charles Gonzaga