Alexandru Ioan Cuza (pronounced [alek'sandru i'o?an 'kuza] (listen), or Alexandru Ioan I, also anglicised as Alexander John Cuza; 20 March 1820 – 15 May 1873) was Prince of Moldavia, Prince of Wallachia, and later Domnitor (Ruler) of the Romanian Principalities.
He was a prominent figure of the Revolution of 1848 in Moldavia.
He initiated a series of reforms that contributed to the modernization of Romanian society and of state structures.