Rudolf Franz Karl Josef was crown prince of Austria from August 21st, 1858 to January 30th, 1889. He apparently committed suicide, though there are many conspiracies about his death.
No, he is Monagasque.
An Archduke. :)
Archduke
Gavrilo Princip
Prince Metternich
Prince Klemens von Metternich
He was born in Koblenz (Germany), so he was German, but also had a bit of Austrian blood in him.
clemans von Metternich
Mainly killing of Austrian Prince by some serbian extremists.
Clemens von Metternich
Klemens Wenzel von Metternich.
Archduke ... good luck with the crossword