The title "Empress of Austria" was established in 1804 when Francis II declared himself Emperor, creating the Austrian Empire. This title was held by the consort of the emperor, who played a ceremonial role and often influenced social and cultural matters within the empire. The most notable Empress of Austria was Elisabeth of Bavaria, commonly known as Sisi, who reigned from 1854 to 1898. She became famous for her beauty and tragic life, which included struggles with mental health and a deep sense of isolation within the royal court.