of Isenburg under House of Isenburg rule Table of rulers Lines of succession Mediatized line of Birstein (1815) Charles, 1st Prince 1803-1820 (1766-1820) Wolfgang Ernst, 2nd Prince 1820-1866 (1798-1866) Prince Victor (1802-1843) Karl, 3rd Prince 1866-1899 (1838-1899) Prince Leopold (1866-1933) -renounced his rights in 1898 Franz Joseph, 4th Prince 1899-1939 (1869-1939) Franz Ferdinand, 5th Prince 1939-1956 (1901-1956) Franz Alexander, 6th Prince 1956–2018 (1943-2018) Alexander, 7th Prince 2018–present (1969) ∞ Sarah Lorenz Princess Alix (2015) Princess Zita (2017) Franz Salvator, Hereditary Prince (2019) Princess Katharina (1971) ∞ Archduke Martin of Austria Princess Isabelle (1973) ∞ Carl, Prince of Wied Princess Sophie (1978) ∞ Georg Friedrich, Prince of Prussia Prince Viktor (1979) ∞ Jungeun Anes Lee Princess Amalia (2016) Princess Victoria (2018) Mediatized line of Büdingen (1806) Ernest Casimir III (1806-1848), in 1840 he was raised to Prince. Ernest Casimir IV (1848-1861) Bruno (1861-1906) Wolfgang (1906-1920) Alfred (1920-1922) Karl (1922-1941) Otto Friedrich (1904-1990), from the Ysenburg-Büdingen-Wächtersbach branch, adopted by Karl in 1936 Wolfgang-Ernst, 8th Prince 1990- (b.1936) ∞ Leonille Princess of Sayn-Wittgenstein-Berleburg Hereditary Prince Casimir-Alexander (b.1967) Prince Tristan Alexander (b.2014) Prince Maximilian (b.1969) Prince Tassilo-Alexander (b.2006) Notable members of the family Imagina of Isenburg-Limburg, c. 1255 – 29 September 1313?, Queen consort of Adolf of Nassau, king of Germany Diether von Isenburg, c. 1412 – 1482, Elector and Archbishop of Mainz Anna of Isenburg-Büdingen, 1460 – 1522 John of Isenburg-Grenzau, Archbishop-Elector of Trier from 1547 until 1556 Salentin IX of Isenburg-Grenzau, c. 1532–1610, Archbishop-Elector of Cologne, Bishop of Paderborn Ernst Casimir II, 2nd Prince of Ysenburg and Büdingen, 1806-1861 Bruno, 3rd Prince of Ysenburg and Büdingen, 1837-1906 Princess Sophie Johanna Maria of Isenburg (born 1978), wife of Georg Friedrich, Prince of Prussia References Works cited External links Official Website – Fürstenhaus Isenburg (Princely House of Isenburg) County of Isenburg States of the Confederation of the Rhine Former states and territories of Rhineland-Palatinate Counties of the Holy Roman Empire Upper Rhenish Circle