Question: Joanna married the son of who?

Context paragraphs:
Joanna (2013 film): Joanna is a 2013 Polish documentary film by Aneta Kopacz about Joanna Salyga, a young woman with cancer with only three months to live, and her efforts to make the most of her time with her husband and young son.  Kopacz came to know Salyga's story through her blog "Chustka."  Salyga's readers sponsored a crowdfunding campaign to produce this film.  "Joanna" was nominated for the Academy Award for Best Documentary (Short Subject) at the 87th Academy Awards.

Bonham Carter family: The Bonham Carter family are descendants of John Bonham-Carter (1788–1838), a British Member of Parliament and barrister, and his wife Joanna Maria Smith.  The MP was the son of Sir John Carter (before 20 December 1741 – 18 May 1808, Mayor of Portsmouth, and son of John Carter, who was a merchant).  He assumed the name Bonham by Royal Licence when he inherited the estates of his cousin Thomas Bonham.  Joanna Maria Smith was the daughter of William Smith, the abolitionist MP; her sister Frances was the mother of Florence Nightingale, and her brother Benjamin was the father of Barbara Bodichon and Benjamin Leigh Smith.  Most of the Bonham-Carters and their circle belonged to Unitarian churches.

Joanna of Castile: Joanna (6 November 1479 – 12 April 1555), called the Mad (Spanish: "Juana la Loca" ), was queen of Castile from 1504 and of Aragon from 1516.  From the union of these two crowns modern Spain evolved.  Joanna married Philip the Handsome on 20 October 1496.  Philip was crowned King of Castile in 1506, initiating the rule of the Habsburgs in Spain.  After Philip's death that same year, Joanna was deemed mentally ill and was confined to a nunnery for the rest of her life.  Though she remained the legal queen of Castile throughout this time, her father, Ferdinand II of Aragon, was regent until his death, when she inherited his kingdom as well.  From 1516, her son, Charles I, ruled as king, while she nominally remained co-monarch.

Joanna Koerten: Joanna Koerten, (married name Joanna Block) (born 17 November 1650, Amsterdam - died 28 December 1715, Amsterdam) was a Dutch artist who excelled in painting, drawing, embroidery, glass etching, and wax modeling.  She achieved fame as a silhouette cutter, the art of creating outline images from pieces of cut paper mounted on a contrasting background.  She produced landscapes, seascapes, flowers, portraits, and religious scenes in this medium.  Her clients included Peter the Great of Russia, Frederick Elector of Brandenburg, Johan de Witt and William III of England.

Joana de Castre: She was born to the noble Pere de Castre and Blanca de So, and married viscount Jofre de Rocabertí, Lord of Peralad, and had four sons and a daughter.  She managed the fief of Rocabertí on several occasions during the absence of her spouse.  In 1461, her spouse participated i the liberation of Charles, Prince of Viana, form the captivity of his father John II of Aragon and Navarre.  When Charles' death resulted in the Catalan Civil War, her brothers sided with the rebels, while Joanna and her spouse sided with John II.  During the royal expedition to Girona, Joanna acted as a mediator between the king and her brother Guillem Ramon.  When her spouse was taken capture in 1464, she was forced to assume responsibility for his fief until his release in 1472.

Philip I of Castile: Philip I (22 July 1478 – 25 September 1506) called the Handsome or the Fair, was the first member of the house of Habsburg to be King of Castile.  The son of Holy Roman Emperor Maximilian I, at the age of three Philip inherited the greater part of the Duchy of Burgundy and the Burgundian Netherlands (as Philip IV) from his mother, Mary, and at 27 briefly succeeded to the Crown of Castile as the husband of Queen Joanna, who was also heir presumptive to the Crown of Aragon.  He was the first Habsburg monarch in Spain.  He never inherited his father's territories or became Holy Roman Emperor because he predeceased his father, but his son Emperor Charles V eventually united the Habsburg, Burgundian, Castilian, and Aragonese inheritances.

Gerald William Lascelles: The Honourable Gerald William Lascelles C.B. (born 26 October 1849, died 11 February 1928) was an author and Deputy Surveyor of the New Forest from 1880 to 1914, and writer of an important book on the area, "Thirty Five Years in the New Forest".  He was the third son of Henry Lascelles, 4th Earl of Harewood and Lady Elizabeth Joanna de Burgh, and graduated from Cambridge University with a Bachelor of Arts.  On 9 February 1875 he married Constance Augusta Mary FitzClarence Phillipson, the daughter of John Burton Phillipson, and had four children with her: Gerald Hubert Lascelles (23 Apr 1876 to 13 Jul 1928), John Beilby Lascelles (19 Feb 1884 to 13 Nov 1907), Richard Lascelles (30 Nov 1887 to 30 Nov 1887), and Cynthia Rachael Lascelles (29 Aug 1885 to 6 Sep 1961), who married George Wentworth Warwick Bampfylde, 4th Baron Poltimore.  He was invested as a Companion of The Most Honourable Order of the Bath (C.B.) in 1914.  Alongside arguably his most famous work on the New Forest, he authored "Sport in the New Forest" and "Forestry and the New Forest" in the Hampshire volumes of the Victoria County History, "The Art of Falconry", and numerous other (mainly sporting) publications.

Joanna Narutowicz: Joanna Narutowicz (Lithuanian: "Joana Narutavičienė" ) (1868-1948) was a Polish teacher and the last owner of the manor in Brewiki (Brevikiai, Lithuania).  Born to the Billewicz family, Joanna was a cousin to Poland's first chief of state Józef Piłsudski and General Leon Billewicz.  She married Stanisław Narutowicz, a noted Lithuanian politician of Polish descent, with whom she ran several cultural facilities.  Notably she headed the gymnasium for girls in Telšiai.  She was also the chairperson of the last Polish gymnasium in Kaunas, Lithuania.  She left Lithuanian SSR after World War II and settled in Warsaw.  She died there and was buried at Powązki Cemetery.

Joanna Mary Boyce: Joanna Mary Boyce (7 December 1831 – 15 July 1861), also known by her married name as Mrs. H.T. Wells, or as Joanna Mary Wells, was an English painter of portraits, genre pictures, and occasionally landscapes.  She was the sister of Pre-Raphaelite watercolourist George Price Boyce, and was herself associated with the Brotherhood.

Joanna of Flanders: Joanna of Flanders (c. 1295 – September 1374) was Duchess of Brittany by her marriage to John of Montfort.  Much of her life was taken up in defence of the rights of her husband and, later, son to the dukedom, which was challenged by the House of Blois during the War of the Breton Succession.  Known for her fiery personality, Joanna led the Montfortist cause after her husband had been captured, and began the fight-back, showing considerable skill as a military leader.

Supporting paragraphs: Joanna of Castile Philip I of Castile
Answer: Holy Roman Emperor Maximilian I