Question: The faather of Princess Mafalda of Savoy was the King of Italy begining in what year?

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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.

Mafalda of Portugal: Infanta Mafalda of Portugal (c. 1195 – Rio Tinto, Gondomar, May 1, 1256; ] ) was a Portuguese "infanta" (princess), later Queen consort of Castile for a brief period.  She was the second youngest daughter of King Sancho I of Portugal and Dulce of Aragon.  Married briefly to the ten-year-old Henry I of Castile, she held for a time the title Queen of Castile.  Upon the dissolution of the marriage, she retired to religious life.

Princess Luisa Cristina of Savoy: Princess Luisa Cristina of Savoy (27 July 1629 – 12 May 1692) was a Princess of Savoy by birth and the eldest daughter of Victor Amadeus I, Duke of Savoy.  She married her uncle Prince Maurice of Savoy but had no children.  She was the owner of the future "Villa della Regina".  She was a first cousin of Louis XIV of France and Charles II of England.

Mafalda von Hessen: Mafalda Margarethe Prinzessin von Hessen (born 6 July 1965), known also as Princess Mafalda of Hesse, is a German aristocrat and fashion designer.  She is the eldest child of Moritz, Landgrave of Hesse and Princess Tatiana of Sayn-Wittgenstein-Berleburg.

Victor Emmanuel III of Italy: Victor Emmanuel III (Italian: "Vittorio Emanuele III" , Albanian: "Viktor Emanueli III" ; 11 November 1869 – 28 December 1947) was the King of Italy from 29 July 1900 until his abdication on 9 May 1946.  In addition, he claimed the thrones of Ethiopia and Albania as Emperor of Ethiopia (1936–41) and King of the Albanians (1939–43), claims not recognised by the other great powers.  During his long reign (nearly 46 years), which began after the assassination of his father Umberto I, the Kingdom of Italy became involved in two World Wars.  His reign also encompassed the birth, rise, and fall of Italian Fascism.

Princess Mafalda of Savoy: Princess Mafalda of Savoy (2 November 1902 – 27 August 1944) was the second daughter of King Victor Emmanuel III of Italy and his wife Elena of Montenegro.  The future King Umberto II of Italy was her younger brother.

Marie Jeanne Baptiste of Savoy-Nemours: Marie Jeanne of Savoy (Marie Jeanne Baptiste; 11 April 1644 – 15 March 1724) was born a Princess of Savoy and became the Duchess of Savoy by marriage.  First married by proxy to Charles of Lorraine in 1662, Lorraine soon refused to recognise the union and it was annulled.  She married Charles Emmanuel II, Duke of Savoy in 1665 who was her kinsman.  The mother of the future Victor Amadeus II of Sardinia who saw the elevation of the House of Savoy to kings, she styled herself as Madama Reale or Madame Royale.  She acted as Regent of Savoy from 1675 in the name of her son Victor Amadeus II, who was her husband's successor.  Her regency officially ended in 1680, but she maintained power until her son banished her from further influence in the state in 1684.  She left a considerable architectural legacy in Turin, and was responsible for the remodelling of the Palazzo Madama, which was her private residence.  At the time of her death she was the mother of the King of Sardinia as well as great grandmother of two other kings, Louis I of Spain and Louis XV of France.

Matilda of Savoy, Queen of Portugal: Matilda of Savoy (French: "Mathilde" , Portuguese: "Mafalda" ;  1125 – 3 December 1157/58 ) was Queen of Portugal.  after her marriage to King Afonso Henriques, the first sovereign of Portugal, whom she married in 1146.

SS Principessa Mafalda: The SS Principessa Mafalda was an Italian transatlantic ocean liner built for the Navigazione Generale Italiana (NGI) company.  Named after Princess Mafalda of Savoy, second daughter of King Victor Emmanuel III, the ship entered NGI's South American service between Genoa and Buenos Aires in 1909.  At the time of her completion she was the largest Italian passenger ship afloat.  The "Mafalda" was known for her luxury and was the preferred mode of travel for such celebrities of the day as Carlos Gardel.

Maria Vittoria of Savoy: Maria Vittoria of Savoy (Maria Vittoria Francesca; 9 February 1690 – 8 July 1766) was a legitimated daughter of Victor Amadeus II of Sardinia, first king of the House of Savoy.  Married to the head of a cadet branch of the House of Savoy, she is an ancestor of the kings of Sardinia and of the Savoy kings of Italy.

Supporting paragraphs: Princess Mafalda of Savoy Victor Emmanuel III of Italy
Answer: 1900