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. 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]