Monsieur in Norway?

My great-great grandmother's family tree stops with a French title. Can any shed any light on this? My great grandfather Ludvig Mikal Jakobsen 1854-1945 His mother Louvise Martine (no last name) 1824-1913 from Åmdal (Lista, Vanse parish) Married 1850 to Jakob Andreas Bergeson Louvise Martine's mother Malene Margrethe Jakobsdtr from Vettland 1783 - 1872 Malene Margrethe's mother Magdalena Nikolaisdtr from Åmdal 1747 - 1788 Magdalena's father Monsieur Nicolai Salvesen from Scheime (today's Skeime I assume) married 1746 to Malene Margrethe Petersdtr Brønning