In the 19th century Royal divorces were extremely scarce. Combing the genealogies, one comes up with just a few:

1809 Napoleon Ω Josephine
1812 King Gustav IV Adolf of Sweden Ω Princess Friederike of Baden
1820 Grand Duke Konstantin Pavlovich Ω Princess Juliane of Saxe-Coburg-Saalfeld
1826 Duke Ernst I of Saxe-Coburg-Saalfeld Ω Princess Luise of Saxe-Gotha-Altenburg
1837 Crown Prince Frederik (VII) of Denmark Ω Princess Wilhelmine of Denmark
1843 Prince Gustav Wasa (Sweden) Ω Princess Luise of Baden
1846 Crown Prince Frederik (VII) of Denmark Ω Duchess Caroline of Mecklenburg-Strelitz
1848 Duke Friedrich of Schleswig-Holstein-Sonderburg-Glücksburg Ω
Princess Adelheid of Schaumburg-Lippe
1849 Princess Marianne of the Netherlands Ω Prince Albrecht of Prussia
1861 Landgrave Alexis of Hesse-Philippsthal-Barchfeld Ω Princess Luise of Prussia
1880 Prince Albert I of Monaco Ω Lady Mary Douglas-Hamilton
Unique in this collection is the 1848 one, where the couple had married in 1841, only to divorce seven years later. Somehow the relation between them must have improved, since they remarried one another in 1854 and had four more children. One wonders what the story might have been there?
Ted Rosvall