|Constantin von Lahnstein|
|Title||Count von Lahnstein|
|Current residence||Madrid, Spain|
Constantin von Lahnstien is a Count von Lahnstein, the legal son of Johannes von Lahnstein and Francesca von Lahnstein, but his biological father is actually Adrian Degenhardt, as Francesca had an affair with him. Johannes knew that Constantin was not his biological son, and sent him to Italy to live with his maternal aunt, Carlotta di Balbi. Constantin eventually returned to Düsseldorf and rejoined the family. He is currently living in Madrid, in Spain.