Romanian United Principalities (1862–66) Principatele Unite Române.
The United Principalities of Moldavia and Wallachia was the official name of Romania, following the 1859 election of Alexandru Ioan Cuza as the Domnitor ("Ruling Prince") of both territories. On 24 January (O.S.) (5 February) 1862, the Principality of Moldavia and the Principality of Wallachia formally united to create the Romanian United Principalities. Alongside Transylvania (attached later, after the WW I), the principalities became the core of Romanian nation state.