Who dated Mary Von Vetsera?

Rudolf, Crown Prince of Austria (Rudolf Franz Karl Josef; 21 August 1858 – 30 January 1889) was the only son and third child of Emperor Franz Joseph I and Empress Elisabeth of Austria. He was heir apparent to the imperial throne of the Austro-Hungarian Empire from birth. In 1889, he died in a suicide pact with his mistress Baroness Mary Vetsera at the Mayerling hunting lodge. The ensuing scandal made international headlines.