The Romanian Orthodox Church, or Patriarchate of Romania, is an autocephalous Eastern Orthodox church in full communion with other Eastern Orthodox Christian churches, and one of the nine patriarchates in the Eastern Orthodox Church. Since 1925, the church's Primate has borne the title of Patriarch. Its jurisdiction covers the territories of Romania and Moldova, with additional dioceses for Romanians living in nearby Serbia and Hungary, as well as for diaspora communities in Central and Western Europe, North America and Oceania. It is the only autocephalous church within Eastern Orthodoxy to have a Romance language for liturgical use.

Alexandru Ioan Cuza was the first domnitor (ruler) 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 Revolution of 1848 in Moldavia. Following his double election, he initiated a series of reforms that contributed to the modernization of Romanian society and of state structures.