Archduchess Elisabeth Marie of Austria_

Archduchess Elisabeth Marie Henriette Stephanie Gisela of Austria was the only child of Rudolf, Crown Prince of Austria, and Princess Stéphanie of Belgium. Her father was the son and heir apparent of Emperor Franz Joseph I of Austria, and her mother was a daughter of King Leopold II of Belgium. She was known to her family as "Erzsi", a diminutive of her name Erzsébet in Hungarian. Later nicknamed The Red Archduchess, she was famous for becoming a socialist and a member of the Austrian Social Democratic Party.