Prince Sixtus of Bourbon-Parma attempted came from which of the two countries that made up The Powers' alliance in 1879?
Prince Sixtus of Bourbon-Parma Prince Sixtus of Bourbon-Parma (1 August 1886 – 14 March 1934) was a son of Robert I, the last reigning Duke of Parma. He was a prince of the Parmesan branch of the royal House of Bourbon; a Belgian officer in World War I; and the central figure in the Sixtus Affair, an attempt to negotiate a treaty to end Austria-Hungary's participation in the Great War separate from its Central Powers allies. He also wrote a number of books.
Princess Marie Louise of Bourbon-Parma Princess Maria Luisa of Bourbon-Parma (17 January 1870 – 31 January 1899) was the eldest daughter of Robert I, the last reigning Duke of Parma. She became Princess-consort of Bulgaria upon her marriage to Ferdinand of Bulgaria, the then prince-regnant (who became Tsar after her death). She was the mother of Tsar Boris III of Bulgaria.