Ich suche einen deutsche film

I'm looking for a German film. I'm Dutch and I've seen this film on a German television, a long time ago.
It was about an ordinary woman who was, if I'm correct, marrying a royal man. But on the day of the wedding, he gets shot in the carriage. His brother (I think it was his brother, or maybe his best friend), who at first glance seems bad, helps her.

Unfortunately, this is all I know.