Who was the first Austro-Hungarian emperor?
Franz Joseph I of Austria
However, Franz Joseph fell deeply in love with Néné's younger sister Elisabeth ("Sisi"), a beautiful girl of fifteen, and insisted on marrying her instead. Sophie acquiesced, despite her misgivings about Sisi's appropriateness as an imperial consort, and the young couple were married on 24 April 1854 in St. Augustine's Church, Vienna.[33]