of Romania married his distant cousin, the Lutheran Princess Marie of Edinburgh, daughter of Anglican Prince Alfred, Duke of Edinburgh, and the Orthodox Grand Duchess Marie Alexandrovna of Russia. Marie and Ferdinand were third cousins in descent from Franz Frederick Anton, Duke of Saxe-Coburg-Saalfeld. Marie's paternal grandparents were Victoria of the United Kingdom and Prince Albert of Saxe-Coburg-Gotha; her maternal grandparents were Alexander II of Russia and Marie of Hesse and by Rhine. The reigning emperor of neighbouring Russia at the time of the marriage was Marie's uncle, Tsar Alexander III, who would be succeeded by his eldest son, Marie's first cousin, Tsar Nicholas II, the following year. The royal Romanian marriage produced three sons (Carol, Nicholas, and Mircea – the last of whom died in infancy) and three daughters (Elisabeta, Maria – called "Mignon" – and Ileana), but it was unhappy. Indeed, the couple's two youngest children, Ileana and Mircea, are widely believed to have been sired by Marie's long-time lover, Barbu Știrbey. King of Romania On 10 October 1914, Ferdinand's uncle, Carol I, died without surviving issue. Ferdinand succeeded him as King of Romania, reigning until his own death on 20 July 1927. Ferdinand was appointed as the 1,174th Knight of the Order of the Golden Fleece in Austria in 1909 and as the 868th Knight of the Order of the Garter in 1924. World War I Though a member of a cadet branch of Germany's ruling Hohenzollern imperial family, Ferdinand presided over his country's entry into World War I on the side of the Triple Entente against the Central Powers, on 27 August 1916. Thus he gained the sobriquet "the Loyal", having kept the oath he swore before the Romanian Parliament in 1914: "I will reign as a good Romanian." As a consequence of this "betrayal" of his German origin, Kaiser Wilhelm II had Ferdinand's name erased from the Hohenzollern House register. Despite the setbacks after the entry into war, when Dobruja and Wallachia were occupied by the Central Powers, Romania fought in 1917 and stopped the German advance into Moldavia. When the new Bolshevik government of Russia sued for peace in 1918, Romania was surrounded by the Central Powers and forced to conclude a peace treaty of its own; however, Ferdinand refused to sign and ratify the Treaty of Bucharest. Allied forces then advanced on the Thessaloniki front and they knocked Bulgaria out of the war.