Romy Schneider with Karlheinz Bohm

Romy Schneider with Karlheinz Bohm (1955) in "Sissi", 
In 1955, when they filmed Sissi, Romy Schneider was only 17 years old, and Karlheinz Böhm was in his early 30s, which created an interesting dynamic between the two on-screen. Their relationship as Sissi and Franz Joseph I is one of youthful love, but it also comes with tension, as Sissi struggles with the constraints of royal life and her evolving role as empress.
Off-screen, Romy Schneider and Karlheinz Böhm developed a warm friendship, though it was rumored that their relationship was a bit strained at times due to the pressures of the films. Both actors went on to have successful careers, though, as mentioned earlier, Schneider would later move away from the Sissi films.