Who married Prince Ferdinand Pius, Duke of Calabria?

Prince Ferdinand Pius (Ferdinando Pio Maria), Duke of Calabria and Castro (25 July 1869, Rome – 7 January 1960, Lindau), was head of the House of Bourbon-Two Sicilies and pretender to the throne of the extinct Kingdom of the Two Sicilies from 1934 to 1960. Professionally, he was an officer in the Spanish and Bavarian armies.

Ludwig III (Ludwig Luitpold Josef Maria Aloys Alfred; 7 January 1845 – 18 October 1921) was the last King of Bavaria, reigning from 1913 to 1918. Initially, he served in the Bavarian military as a lieutenant and went on to hold the rank of Oberleutnant during the Austro-Prussian War. He entered politics at the age of 18, as a member of the Bavarian parliament, and was a keen participant, supporting electoral reforms. Later in life, he served as regent and de facto head of state from 1912 to 1913, ruling for his cousin, Otto. After the Bavarian parliament passed a law allowing him to do so, Ludwig deposed Otto and assumed the throne for himself. He led Bavaria during World War I. His short reign was seen as championing conservative causes and he was influenced by the Catholic encyclical Rerum novarum.

After the German Revolution of 1918–1919, the German Empire was dissolved and the Weimar Republic was created. As a result of this revolution, the Bavarian throne was abolished along with the other monarchies of the German states, ending the House of Wittelsbach's 738-year reign over Bavaria. Fearing that he might be a victim of an assassination, Ludwig fled to Hungary, Liechtenstein and then Switzerland. He returned to Bavaria in 1920 and lived at Wildenwart Castle. He died shortly after, when he was staying at Nádasdy Mansion in Sárvár.