Question: Princess Maria Clotilde of Savoy's mother died in what year?

Context paragraphs:
Maria Clotilde of Naples and Sicily: Maria Clotilde (Italian: "Maria Clotilda Teresa Amelia Antonietta Giovanna Battista Anna Gaetana Pulcheria" ) was a member of the House of Bourbon in the Kingdom of the Two Sicilies.  She was styled "Princess of Naples and Sicily".

Clotilde Rosa: Maria Clotilde Belo de Carvalho Rosa Franco (born 11 May 1930), known as Clotilde Rosa, is a Portuguese harpist, music educator and composer.

Princess Maria Clotilde of Savoy: Maria Clotilde of Savoy (Ludovica Teresa Maria Clotilde; 2 March 1843 – 25 June 1911) was born in Turin to Vittorio Emanuele II, later King of Italy and his first wife Adelaide of Austria.  She was the wife of Napoléon Joseph Charles Paul Bonaparte.

Princess Maria Felicita of Savoy: Princess Maria Felicita of Savoy (19 March 1730 – 13 May 1801)) was a princess of the House of Savoy, the third daughter of Charles Emmanuel III of Sardinia and his second wife, Polyxena of Hesse-Rotenburg.

Princess Maria Anna Victoria of Savoy: Princess Maria Anna Victoria of Savoy (German: "Maria Anna Victoria von Savoyen" ; 11 September 1683 – 11 October 1763) was the daughter of Prince Louis Thomas of Savoy, Count of Soissons, and Uranie de La Cropte de Beauvais.

Adelaide of Austria: Adelaide of Austria (Adelheid Franziska Marie Rainera Elisabeth Clotilde; 3 June 1822 – 20 January 1855) was the Queen of Sardinia by marriage to Victor Emmanuel II of Sardinia, future King of Italy, from 1849 until 1855 when she died as a result of childbirth.  She was the mother of Umberto I of Italy.

Moncalieri: Moncalieri (] ; Piedmontese: "Moncalé" ) is a town and "comune" of 57,530 inhabitants (1-1-2017) about 8 km directly south of downtown Turin (to whose Metropolitan City it belongs), in Piedmont, Italy.  It is notable for its castle, built in the 12th century and enlarged in the 15th century, which later became the favorite residence of Maria Clotilde and Victor Emmanuel II of Italy.  It is part of the World Heritage Site "Residences of the Royal House of Savoy".

Princess Maria Maximilianovna of Leuchtenberg: Princess Maria Maximilianovna of Leuchtenberg, also known as Princess Maria Romanovskya, Maria, Princess Romanovskaja, Maria Herzogin von Leuchtenberg or Marie Maximiliane (16 October 1841 – 16 February 1914) was the eldest daughter of Maximilian de Beauharnais, 3rd Duke of Leuchtenberg and his wife Grand Duchess Maria Nikolaevna of Russia.  She married Prince Wilhelm of Baden.  The couple's son, Prince "Maximilian" of Baden, was Germany's last Imperial chancellor.

Maria Letizia Bonaparte, Duchess of Aosta: Maria Letizia Bonaparte (Marie Laetitia Eugénie Catherine Adélaïde; 20 November 1866 – 25 October 1926) was one of three children born to Prince Napoléon and his wife Princess Maria Clotilde of Savoy.  In 1888 she married Prince Amadeo, Duke of Aosta, the former king of Spain.  Maria Letizia became the Duchess of Aosta, Duke of Aosta being a title by which Amadeus was known before and after his kingship.  Their marriage was instrumental in almost reviving French hopes of reinstating the Bonaparte dynasty into a position of power, as seen in the days of Napoleon III.

Princess Maria Pia of Bourbon-Parma: Princess Maria Pia of Bourbon-Parma (née Princess Maria Pia of Savoy; born 24 September 1934) is the eldest daughter of Umberto II of Italy and Marie-José of Belgium.  She is the older sister of Princess Maria Gabriella of Savoy, Vittorio Emanuele, Prince of Naples, and Princess Maria Beatrice of Savoy.

Supporting paragraphs: Princess Maria Clotilde of Savoy Adelaide of Austria
Answer: 1855