#OnThisDay in 1816 Maria Isabel of Braganza married her maternal uncle King Ferdinand VII of Spain.

#OnThisDay in 1956 Princess Marie Eleonore of Albania died in a political prison for women in Romania following bowel surgery.

#OnThisDay in 1700 Countess Caroline of Erbach-Fürstenau was born as the daughter of Philipp Charles, Count of Erbach-Fürstenau and Charlotte Amalie of Kunowitz. On 19 June 1726, she married Ernst Frederick II, Duke of Saxe-Hildburghausen and they had four children together. She died on 7 May 1758.

#OnThisDay in 1710 Charlotte Felicitas of Brunswick-Lüneburg died following childbirth. She was born in 1671 as the daughter of John Frederick, Duke of Brunswick-Lüneburg and Benedicta Henrietta of the Palatinate. In 1696, she married Rinaldo d'Este, Duke of Modena and they had seven children.

#OnThisDay in 1791 Princess Frederica of Prussia married Frederick, Duke of York at Charlottenburg Palace.

#OnThisDay in 1670 Aurelia Spinola died. She was born in 1620 as the daughter of Luca Spinola and Pellina Spinola. On 7 July 1641, she married Prince Ercole, Marquis of Baux and their only son succeeded as Prince of Monaco.

#OnThisDay in 1814 Princess Maria Filiberta of Savoy was born as the daughter of Prince Joseph Maria of Savoy-Villafranca and Pauline Benedictine de Quélen de Vauguyon. On 16 June 1837, she married Prince Leopold, Count of Syracuse and they had one short-lived daughter. She died on 2 January 1874.

#OnThisDay in 1853 Princess Thyra of Denmark was born as the daughter of the future King Christian IX of Denmark and Princess Louise of Hesse-Kassel. In 1878, she married Crown Prince Ernest Augustus of Hanover, and they had six children. She died on 26 February 1933.

#OnThisDay in 1680 Princess Luise Dorothea of Prussia was born as the daughter of the future King Frederick I of Prussia and Elisabeth Henriette of Hesse-Kassel. On 31 May 1700, she married Frederick, Hereditary Prince of Hesse-Kassel but they had no surviving children. She died on 23 December 1705.

#OnThisDay in 1881 Behiye Sultan was born as the daughter of Şehzade Mehmed Selaheddin of the Ottoman Empire and Naziknaz Hanım. In 1910, she married Hafız Hakkı Pasha but they had no children together. She died on 5 March 1948. Photo: Second from the right

#OnThisDay in 1313 Imagina of Isenburg-Limburg died. She was born circa 1255 as the daughter of Gerlach IV, Count of Isenburg-Limburg and Imagina of Blieskastel. In 1270, she married the future Adolf, King of the Romans and they had at least eight children together, though not all lived to adulthood

#OnThisDay in 1882 Princess Maria Pia of Bourbon-Two Sicilies. She was born in 1849 as the daughter of King Ferdinand II of the Two Sicilies and Maria Theresa of Austria. In 1869, she married Robert I, the exiled Duke of Parma and Piacenza and they had twelve children.

NEW: Who would be Queen of Yugoslavia today?

#OnThisDay in 1213 Gertrude of Merania, Queen of Hungary, was assassinated.

#OnThisDay in 1657 Emilia Secunda Antwerpiana of Nassau, Countess Palatine of Zweibrücken-Landsberg, died.

#OnThisDay in 1538 Mary of Bourbon died.

#OnThisDay in 1765 Princess Wilhelmine Louise of Nassau-Weilburg was born as the daughter of Carolina of Orange-Nassau and Charles Christian, Prince of Nassau-Weilburg. In 1786, Wilhelmine married Heinrich XIII, Prince Reuss of Greiz and they had two surviving sons. She died on 10 October 1837.

As we look ahead to the abdication and "Trounwiessel" in Luxembourg, read more about the soon-to-be Grand Duchess Stéphanie.

#OnThisDay in 1564 Sibylla of Anhalt was born as the daughter of Joachim Ernest, Prince of Anhalt, and Agnes of Barby-Mühlingen. In 1581, she married the future Frederick I, Duke of Württemberg and they had 15 children together, though not all lived to adulthood. She died on 26 October 1614.

#OnThisDay in 1891 Princess Ida of Schaumburg-Lippe died shortly after giving birth to a daughter. She was born in 1852 as the daughter of Adolf I, Prince of Schaumburg-Lippe and Hermine of Waldeck and Pyrmont. In 1872, Ida married Heinrich XXII, Prince Reuss of Greiz and they had six children.

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#OnThisDay in 1864 Mitzi Kaspar, mistress of Crown Prince Rudolf of Austria, was born.

#OnThisDay in 189 Dong Zhuo forced Empress Dowager He to depose Emperor Shao.

#OnThisDay in 1533 the proxy wedding between Christina of Denmark and Francesco II Sforza, Duke of Milan, took place.

#OnThisDay in 2006 Maria Feodorovna, Empress of Russia, was finally buried in Russia, 78 years after her death.

#OnThisDay in 1701 Johannetta, Countess of Sayn-Altenkirchen died. She was born in 1632 as the daughter of Ernest, Count of Sayn-Wittgenstein-Sayn and Louise Juliane of Erbach.

#OnThisDay in 1947 Elisabeth von Gutmann, Princess of Liechtenstein, died.

#OnThisDay in 1636 Princess Dorothea Sophie of Schleswig-Holstein-Sonderburg-Glücksburg was born as the daughter of Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg and Sophie Hedwig of Saxe-Lauenburg. She died on 6 August 1689.

#OnThisDay in 1433 Princess Joan of France died. She was born in 1391as the daughter of King Charles VI of France and Isabeau of Bavaria. In 1396, she married the future John V, Duke of Brittany and they had seven children together, although three died in childhood.

#OnThisDay in 1871 Isabel, Princess Imperial of Brazil – acting as regent - signed a new anti-slavery act, The Law of Free Birth, which freed all children born of slaves after that date.

#OnThisDay in 1760 Maria Amalia of Saxony, Queen of Spain, died.

#OnThisDay in 1788 Augusta of Brunswick-Wolfenbüttel, Duchess Frederick of Württemberg, died.

As we look ahead to the abdication and "Trounwiessel" in Luxembourg, read more about the personal union with the Kingdom of the Netherlands.

#OnThisDay in 1125 Richeza of Berg died. She was born circa 1095 as the daughter of Henry I, Count of Berg and his wife Adelheid of Mochental. She married Vladislav I, Duke of Bohemia around 1111 but they had no children.

NEW: Imperial Consort Ding was an imperial consort to the infamous Cao Cao. She was originally his main wife. After the death of her stepson, Cao Ang, Imperial Consort Ding blamed her husband for his death. The death of Cao Ang caused Imperial Consort Ding’s marriage to fall apart.

#OnThisDay in 1657 Sofia Alekseyevna of Russia was born as the daughter of Tsar Alexis by his first wife, Maria Miloslavskaya. She died in 1704.

#OnThisDay in 823 Ermentrude of Orléans was born as the daughter of Odo, Count of Orléans and his wife Engeltrude. She married the future Charles the Bald, King of West Francia, in 842 and they had 10 children, though not all lived to adulthood. She died on 6 October 869.

#OnThisDay in 1862 Princess Maria Pia of Savoy married King Luís I of Portugal by proxy.

#OnThisDay in 1651 Erdeni Bumba married Emperor Shunzhi.

#OnThisDay in 1901 Princess Maria Alix of Saxony was born as the daughter of the future King Frederick Augustus III of Saxony and Archduchess Louise of Austria. On 25 May 1921, she married Franz Joseph, Prince of Hohenzollern-Emden and they had four children together. She died on 11 December 1990.

#OnThisDay in 1710 Hatice Sultan was born as the daughter of Sultan Ahmed III of the Ottoman Empire and Rukiye Kadın. In 1724, she married Hafız Ahmed Pasha but she was widowed in 1730. That same year, she married Halil Ağa and they had one son together. She died in 1738.

#OnThisDay in 1647 Princess Changping of the Ming dynasty died.

NEW: Happy 25th birthday to Princess Salma of Jordan!

As we look ahead to the abdication and "Trounwiessel" in Luxembourg, read more about Walferdange Castle and the Mother of Luxembourg.