Archduchess Katharina, Archduchess Martin of Austria-Este (born 1971) (b. 1971) Parents Prince Franz Alexander, 9th Prince of Isenburg Christine, Countess von Saurma Children Luigi Amedeo Thadeus Erzherzog von Österreich Bartolomäus Erzherzog von Österreich-Este Helene Cristina Margherita Erzherzogin von Österreich Emmanuel Erzherzog von Österreich-Este Siblings Sophie, Princess of Prussia Prince Alexander, 10th Prince of Isenburg Isabelle, Princess of Wied Prince Viktor of Isenburg Partners Archduke Martin of Austria-Este