{{Infobox former country |native_name = |conventional_long_name = United Principalities of Moldavia and Wallachia (1859–1862)Romanian United Principalities (1862–1866)Principality of Romania (1866–1881) |common_name = United Principalities |status = Vassal |empire = Ottoman Empire |status_text = De jure vassal of the Ottoman Empire (1859–1877) |era = |year_start = 1859 |year_end = 1881 |date_start = 24 January |event_start = Union between Moldavia and Wallachia |event1 = First common government |date_event1 = 22 January 1862 |event2 = First Constitution |date_event2 = 13 July 1866 |event3 = Independence from the Ottoman Empire |date_event3 = 9 May 1877 |date_end = 14 March |event_end = Kingdom established |p1 = Principality of Moldavia |flag_p1 = Flag of Moldavia in 1831.svg |p2 = Principality of Wallachia |flag_p2 = Flag of Wallachia 1858.svg |p3 = Northern Dobruja |flag_p3 = Flag of the Ottoman Empire.svg |s1 = Kingdom of Romania |flag_s1 = Flag of Romania.svg |s2 = Bessarabia Governorate |flag_s2 = Flag of the Russian Empire (black-yellow-white).svg |image_flag = Flag of the United Principalities of Wallachia and Moldavia (1859 - 1862).svg |alt_flag = Flag used 1862-1866 |alt_flag2 = Flag used 1866-1881 |flag = Flag of Romania |flag_type = Flag |image_coat = Principality of Romania - 1872 CoA.svg |coa_size = 100 |image_map = Romania 1859-1878.png |image_map_caption = The United Principalities (Romania) 1859–1878, shown in light beige |national_motto = |national_anthem = {{ubl|"Hora Unirii'"|"Hora of the Union"|(popular, unofficial)}} |common_languages = |religion = Romanian Orthodox, Catholicism, Judaism, Reformed Church |capital = |government_type = |leader1 = Alexandru Ioan Cuza |leader2 = Carol I |year_leader1 = 1859–1866 |year_leader2 = 1866–1881 |title_leader = Domnitor (Prince) |representative1 = Lascăr Catargiu |representative2 = Nicolae Golescu |representative3 = Nicolae Haralambie |year_representative1 = 1866 |year_representative2 = 1866 |year_representative3 = 1866 |title_representative = Regency |deputy1 = Barbu Catargiu (first) |deputy2 = Ion Brătianu (last) |year_deputy1 = 1862 |year_deputy2 = 1879–1881 |title_deputy = President of the Council of Ministers |legislature = Parliament |house1 = Senate |house2 = Assembly of Deputies |stat_year1 = 1860 |stat_area1 = 123,335 |stat_pop1 = 3,917,541 |stat_year2 = 1881 |stat_area2 = 130,177 |stat_pop2 = 4,545,821 |ref_area1 = |ref_pop1 = |ref_area2 = |ref_pop2 = |currency = |today = |footnotes = |demonym=Romanian|area_km2=|area_rank=|GDP_PPP=|GDP_PPP_year=|HDI=|HDI_year=|alt_coat=Coat of arms 1872-1881}} The United Principalities of Moldavia and Wallachia (), commonly called United Principalities, was the personal union of the Principality of Moldavia and the Principality of Wallachia, formed on when Alexandru Ioan Cuza was elected as the Domnitor (Ruling Prince) of both principalities, which were autonomous but still vassals of