Is anyone familiar with this princely family. A great great aunt of mine married a prince Gudonoff who was killed during the Revolution. Her name was Marguerite Thurner (de Toronyi) who was born in Hungary, but moved to Paris, France to become an Opera singer. She first married an older Marquis de Bergerac, but after he passed she came to Russia to visit her sister and met this Prince. They married. After he was killed, the family, including his mother and sister, moved to Paris with her. Any lead would be great!