Carol I (20 April 1839 – 27 September (O.S.) / 10 October (N.S.) 1914), born Prince Karl of Hohenzollern-Sigmaringen, was the ruler of Romania from 1866 to 1914. He was elected Ruling Prince (Domnitor) 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, he proclaimed Romania an independent and sovereign nation. The defeat of the Ottoman Empire (1878) in the Russo-Turkish War secured Romanian independence. He was proclaimed King of Romania 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 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. Domestic political life, still dominated by the country's wealthy landowning families organized around the rival Liberal and Conservative parties, was punctuated by two widespread peasant uprisings, in Wallachia (the southern half of the country) in April 1888 and in Moldavia (the northern half) in March 1907.

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