Who married Ferdinand I of Bulgaria?

Fernando I de Bulgaria (en búlgaro: Ferdinand I - Фердинанд I; Viena, 26 de febrero de 1861-Coburgo, 10 de septiembre de 1948) fue príncipe y más tarde zar de Bulgaria. Durante su largo reinado, Bulgaria proclamó la independencia del Imperio otomano y participó en diversas guerras para ampliar su territorio. Se vio forzado a abdicar tras la derrota del país en la Primera Guerra Mundial en 1918 y vivió desde entonces en el exilio hasta su muerte en 1948.

Princess Maria Luisa of Bourbon-Parma (Marie Louise Pia Theresa Anna Ferdinanda Francisca Antoinette Margaret Josepha Carolina Blanche Lucia Apollonia; 17 January 1870 – 31 January 1899) was the eldest daughter of Robert I, the last reigning Duke of Parma. She became Princess of Bulgaria upon her marriage to Ferdinand I, the then prince-regnant (who became Tsar after the Bulgarian Declaration of Independence in 1908). She was the mother of Tsar Boris III of Bulgaria.

Princess Eleonore Caroline Gasparine Louise Reuss-Köstritz (Bulgarian: Елеонора Българска; 22 August 1860 – 12 September 1917) was Tsaritsa (Queen) of Bulgaria, as the second wife of Ferdinand I of Bulgaria and member of the ancient House of Reuss by birth.

Alžbeta Brezáková (1921 – 24 April 2015) was a Slovak nurse and the third wife of Ferdinand I of Bulgaria. The daughter of a castellan employed by the House of Saxe-Coburg and Gotha-Koháry, she served as a royal nanny and as personal assistant to the deposed Tsar Ferdinand while he lived in exile in Germany. They were secretly married in 1947. She was 60 years younger than her husband and was the first Slovak and the first commoner to marry into the Bulgarian royal family. The validity of their morganatic marriage was questioned by Slovak writer Anton Hykisch, whose family was also employed by the Tsar.