Ida von Ferenczy was drafted to break the news of this event to Empress Elizabeth.
The perpetrator of this event initially asked his former lover Mizzi Kaspar to join him, but she declined. Brigitte Hamann wrote a book about the perpetrator of this event in which she claimed that his syphilis infection precipitated this event. Gerd Holler proposed that its impetus was a botched abortion. A convent for the Discalced Carmelites was built at the location of this event, which was ordered to be (*) burned by the emperor in its aftermath. Ida von Ferenczy was drafted to break the news of this event to Empress Elizabeth. Rumors that this event was sparked by a familial argument were spread by Otto von Bismarck. It led to Karl Ludwig becoming the heir apparent to Austria-Hungary. For 10 points, name this 1889 disaster in which Mary Vetsera and Crown Prince Rudolf of Austria were killed in a hunting lodge.
The perpetrator of this event initially asked his former lover Mizzi Kaspar to join him, but she declined.
Mayerling Incident [or the deaths by suicide of Mary Vetsera and Rudolf of Austria before mentioned; prompt on partial answers]