Nikolaus was born in Vienna 12 December 1765, the son of Prince Anton Esterházy and his first wife, Maria Theresia, Countess Erdödy de Monyorokerek et Monoszlo (1745–1782). His father Anton was the son of Nikolaus I, whom he succeeded as reigning prince on the latter's death in 1790. In 1783, the younger Nikolaus, aged 17, married the 15-year-old Maria Josepha, Princess von und zu Liechtenstein (1768–1845). According to Mraz (2009b), the marriage was not a happy one (see below, "debauchery"). It produced three children: Paul (1786–1866), who succeeded Nikolaus as prince, Leopoldine (1788–1846), and Nikolaus (1799–1844).