United Principalities
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 the Ottoman Empire. On , Moldavia and Wallachia formally united to create the Romanian United Principalities, the core of the Romanian nation state.