John of Austria Spanish military leader (1547–1578) (1547–1578) Parents Barbara Blomberg Charles V Children María Anna de Austria Giovanna of Austria Siblings Philip II of Spain Margaret of Parma Infante Fernando of Austria Joanna of Austria, Princess of Portugal Maria of Austria, Holy Roman Empress Isabel of Castile Tadea of Austria Juana de Austria y Xériga Juan Austria y Portugal Partners María de Mendoza Diana Falangola