William, Prince of Hohenzollern (German: Wilhelm August Karl Joseph Peter Ferdinand Benedikt Fürst von Hohenzollern) (7 March 1864 – 22 October 1927) was the eldest son of Leopold, Prince of Hohenzollern, and Infanta Antónia of Portugal.
William was an older brother of Ferdinand of Romania. His first cousins included (among others) Carlos I of Portugal, Albert I of Belgium, Frederick Augustus III of Saxony, and Princess Maria Josepha of Saxony.
Between 1880 and 1886, William was heir presumptive to the Romanian throne. On 20 December 1886, he renounced his rights to the throne in favour of his brother Ferdinand.
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Family
On 27 June 1889, William married Princess Maria Teresa of Bourbon-Two Sicilies. Her parents were Prince Louis, Count of Trani and Mathilde Ludovika, Duchess in Bavaria. Louis was the eldest son of Ferdinand II of the Two Sicilies and his second wife Archduchess Maria Theresa of Austria. Mathilde was the fourth daughter of Maximilian, Duke in Bavaria and Princess Ludovika of Bavaria. William and Maria Teresa had three children:
Augusta Victoria of Hohenzollern (19 August 1890 – 29 August 1966). Married first Manuel II of Portugal and secondly Robert, Count Douglas.
Prince Frederick Victor of Hohenzollern (30 August 1891 – 6 February 1965). Married Princess Margarete Karola of Saxony. She was a daughter of Frederick Augustus III of Saxony and Archduchess Luise, Princess of Tuscany.