Catharina de Habsbourg Austrian historian (b. 1972) Parents Archduke Rudolf of Austria Children Conte Rodolfo Secco d'Aragona Conte Nicolo Secco d'Aragona Conte Constantino Secco d'Aragona Siblings Johannes Karl Erzherzog von Österreich Karl Peter Erzherzog von Österreich Archduchess Maria Anna of Austria Archduke Simeon of Austria Partners Conte Massimiliano Secco d'Aragona