Domnitor in the context of "Romania in the Middle Ages"

Alexandru Ioan Cuza (Romanian: [alekˈsandru iˈo̯aŋ ˈkuza] , or Alexandru Ioan I, also Anglicised as Alexander John Cuza; 20 March [O.S. 8 March] 1820 – 15 May 1873) was the first domnitor (prince) of the Romanian Principalities through his double election as Prince of Moldavia on 5 January 1859 and Prince of Wallachia on 24 January 1859, which resulted in the unification of the two states. He was a prominent figure of the Moldavian Revolution of 1848. Following his double election, he initiated a series of liberal and progressive reforms that contributed to the modernization of Romanian society and of state structures.

As ruler of the Romanian Principalities, he supported a political and diplomatic activity for the recognition of the union of Moldavia and Wallachia by the suzerain Ottoman Empire and achieved constitutional and administrative unity between Moldavia and Wallachia in 1862, when the Romanian Principalities officially adopted the name Romanian United Principalities with a single capital at Bucharest, a single national assembly and a single government.

Carol I or Charles I of Romania (born Karl Eitel Friedrich Zephyrinus Ludwig von Hohenzollern-Sigmaringen; 20 April 1839 – 10 October [O.S. 27 September] 1914), nicknamed the King of Independence (Romanian: Regele Independenței), was the monarch of Romania from 1866 to his death in 1914, ruling as Prince (Domnitor) from 1866 to 1881, and as King from 1881 to 1914. He was elected Prince of the Romanian United Principalities on 20 April 1866 after the overthrow of Alexandru Ioan Cuza by a palace coup d'état. In May 1877, Romania was proclaimed an independent and sovereign nation. The defeat of the Ottoman Empire (1878) in the Russo-Turkish War secured Romanian independence, and he was proclaimed King on 26 March [O.S. 14 March] 1881. He was the first ruler of the Hohenzollern-Sigmaringen dynasty, which ruled the country until the proclamation of a socialist republic in 1947.

During his reign, Carol I personally led Romanian troops during the Russo-Turkish War and assumed command of the Russo-Romanian army during the siege of Plevna. The country achieved internationally recognized independence via the Treaty of Berlin, 1878 and acquired Southern Dobruja from Bulgaria in 1913. In 1883 the king entered a top-secret military alliance with the Austro-Hungarian Empire, despite popular demands against Hungary. When World War I broke out he was unable to activate the alliance. Romania remained neutral and in 1916 joined the Allies.

The United Principalities of Moldavia and Wallachia (Romanian: Principatele Unite ale Moldovei și Țării Românești), commonly called United Principalities or Wallachia and Moldavia, was the personal union of the Principality of Moldavia and the Principality of Wallachia. The union was formed on 5 February [O.S. 24 January] 1859 when Alexandru Ioan Cuza was elected as the Domnitor (Ruling Prince) of both principalities. Their separate autonomous vassalage in the Ottoman Empire continued with the unification of both principalities. On 3 February [O.S. 22 January] 1862, Moldavia and Wallachia formally united to create the Romanian United Principalities, the core of the Romanian nation state.

In February 1866, Prince Cuza was forced to abdicate and go into exile by a political coalition led by the Liberals; the German prince Karl of Hohenzollern-Sigmaringen was offered the throne and, on 22 May [O.S. 10 May] 1866 he entered Bucharest for the first time. In July the same year, a new constitution came into effect, giving the country the name of Romania; internationally, this name was used only after 1877, since at the time it shared a common foreign policy with the Ottoman Empire. Nominally, the new state remained a vassal of the Ottoman Empire. However, by this time the suzerainty of the Sublime Porte had become a legal fiction. Romania had its own flag and anthem; after 1867, it had its own currency as well.

The two ad hoc divans were legislative and consultative assemblies of the Danubian Principalities (Moldavia and Wallachia), vassals of the Ottoman Empire. They were established by the Great Powers under the Treaty of Paris. By then, the Crimean War had taken the two states out of Russia's sphere of influence, and had nullified the Moldo-Wallachian Regulamentul Organic regime. Officially, the two assemblies were provisional replacements for the traditional assemblies, the Sfaturi (or Divanuri). The term "divan", is derived from the Ottoman rule, being the name of a high governmental body in a number of Islamic states.

The elections for the two Divans confronted two local movements: the National Party, which supported the unification of Moldavia and Wallachia, as "Romania"; the anti-unionists, which sought to maintain the status quo. The National Party emerged as the victor in 1859, when its candidate Alexandru Ioan Cuza was crowned Domnitor over both countries. The resulting United Principalities were the political embryo of modern Romania.

The 1866 Constitution of Romania was the fundamental law that capped a period of nation-building in the Danubian Principalities, which had united in 1859. Drafted in a short time and closely modeled on the 1831 Constitution of Belgium, then considered Europe's most liberal, it was substantially modified by Prince (later King) Carol and adopted by the Constituent Assembly. The newly installed Prince then promulgated it on 13 July [O.S. 1 July] 1866. In a bold move, the constitution was drafted without input from the major powers. Notably, the framers did not even consult the Ottoman Empire even though Romania was nominally an Ottoman vassal. By then, however, the Ottoman Empire's sovereignty over Romania had long since become a legal fiction, though this only ended when Romania gained de jure independence in 1878.