Question: The eldest daughter of Princess Louise of Denmark and Norway was the wife of a king whose motto was what?

Passages:
Princess Margherita of Bourbon-Parma (Italian: "Margherita Maria Teresa Enrichetta, Principessa di Parma" ) (1 January 1847 – 29 January 1893) was the eldest child and daughter of Charles III, Duke of Parma and Princess Louise Marie Thérèse of France, the eldest daughter of Charles Ferdinand, Duke of Berry and Princess Caroline Ferdinande Louise of the Two Sicilies.  Margherita was thus a great-granddaughter of Charles X of France.  She was born in Lucca, Duchy of Parma.  She was a niece of Henri, comte de Chambord, disputedly King of France and Navarre from 2 to 9 August 1830 and afterwards the Legitimist Pretender to the throne of France from 1844 to 1883.  Through her marriage to Carlos, Duke of Madrid, Carlist claimant to the Spanish throne, Margherita was titular Queen consort of Spain, France, and Navarre. Princess Louise of Denmark ("Louise Caroline Josephine Sophie Thyra Olga") (17 February 1875 – 4 April 1906) was a Danish princess, the third child and oldest daughter of Frederick VIII of Denmark and his wife, Princess Louise of Sweden and Norway. Arthur Collins CB, MVO, Commander, Hohenzollern Order (26 June 1845 – 21 November 1911), was Equerry and Comptroller for Princess Louise, Queen Victoria's 4th daughter and Gentleman Usher in the households of Queen Victoria and King Edward VII.  He attended Princess Louise in her role as the wife of John Campbell, 9th Duke of Argyll (at that time Marquis of Lorne), who was Governor General and Vice Regent of Canada between 1878 and 1883.  Collins represented Princess Louise at the funerals of Lord Beaconsfield, Benjamin Disraeli, and William Ewart Gladstone, the two competing Prime Ministers during Queen Victoria's reign.  Collins attended as a Gentleman Usher the coronation of King Edward VII and probably Victoria's funeral. Princess Louise was a sidewheel steamboat built in 1869.  From 1869 to 1879 this ship was named "Olympia".  In 1879 the name was changed to "Princess Louise", after Princess Louise, Duchess of Argyll, a daughter of Queen Victoria who was married to Marquess of Lorne (1845-1914), Governor General of Canada from 1878 to 1883.  "Princess Louise" was the last sidewheeler to be operated commercially on the coast of British Columbia. Princess Marie of Windisch-Graetz (11 December 1856 – 9 August 1929) was an Austrian noble.  She was the daughter of Hugo, Prince of Windisch-Grätz, and Princess Louise of Mecklenburg-Schwerin (herself the eldest daughter of Grand Duke Paul Frederick and Princess Alexandrine of Prussia). Princess Louise of Denmark and Norway (Danish: "Louise af Danmark" ; Norwegian: "Louise av Danmark" ) (20 January 1750 – 12 January 1831) was born to Frederick V of Denmark and Louise of Great Britain.  Her eldest daughter, Marie of Hesse-Kassel, was the wife of Frederick VI of Denmark. Frederick VI (Danish and Norwegian: "Frederik"; 28 January 17683 December 1839) was King of Denmark from 13 March 1808 to 3 December 1839 and King of Norway from 13 March 1808 to 7 February 1814.  From 1784 until his accession, he served as regent during his father's mental illness and was referred to as the "Crown Prince Regent" ("kronprinsregent").  For his motto he chose "God and the just cause" (Danish: "Gud og den retfærdige sag" ) and since the time of his reign, succeeding Danish monarchs have also chosen mottos in the Danish language rather than the formerly customary Latin. Princess Alice of Bourbon-Parma (Italian: "Alicia Maria Carolina Ferdinanda Rachael Giovanna Filomena" ; 27 December 1849, Parma, Duchy of Parma – 16 November 1935, Schwertberg, Austria) was the youngest daughter of Charles III, Duke of Parma and Princess Louise Marie Thérèse of France, the eldest daughter of Charles Ferdinand, Duke of Berry and Princess Caroline Ferdinande Louise of the Two Sicilies. Princess Louise of Belgium (18 February 1858 in Brussels – 1 March 1924 in Wiesbaden) was the eldest daughter of Leopold II and his wife, Marie Henriette of Austria.  Louise was named after her paternal grandmother, the Belgian queen Louise of Orleans, and her mother. Prince Henry of Bourbon-Parma, Count of Bardi (Italian: "Enrico Carlo Luigi Giorgio, Principe di Parma, Conte di Bardi" ) (12 February 1851 in Parma, Duchy of Parma – 14 April 1905 in Menton, France) was the youngest son and child of Charles III, Duke of Parma and his wife Princess Louise Marie Thérèse of France, the eldest daughter of Charles Ferdinand, Duke of Berry and Princess Caroline Ferdinande Louise of the Two Sicilies.

Supporting sentences:
 Her eldest daughter, Marie of Hesse-Kassel, was the wife of Frederick VI of Denmark. Frederick VI (Danish and Norwegian: "Frederik"; 28 January 17683 December 1839) was King of Denmark from 13 March 1808 to 3 December 1839 and King of Norway from 13 March 1808 to 7 February 1814.  For his motto he chose "God and the just cause" (Danish: "Gud og den retfærdige sag" ) and since the time of his reign, succeeding Danish monarchs have also chosen mottos in the Danish language rather than the formerly customary Latin.