On "Kronprinz Rudolf" Max von Thun played the role of the Heir Archduke
Rudolf, whose first cousin and successor as Heir Archduke
Franz-Ferdinand was married (not dynastically) to the Countess Sophia
Chotek, who happened to be Max's great-grand-aunt. At the same time,
one of the characters was the Chancellor Eduard, Count Taaffe, whose
great-great-grandfather was Countess Sophia Chotek's
great-great-grand-uncle.