Rudolf (1858–1889), son and heir of Emperor Franz Joseph I of Austria, who died at the age of 30, together with his mistress, under mysterious circumstances most often explained as a suicide, bringing an effective end to the Habsburg dynasty. In 1881, Rudolf married Stephanie, daughter of King Leopold II of Belgium. Scarce original 4.25 x 6.25 cabinet full-length portrait of Rudolf and Stephanie standing side-by-side, signed in the lower border in black ink, “Rudolf” and “Stephanie.” Published by H. Eckert of Prague. In fine condition, with trimmed left and right edges. RR Auction COA.