She was the first Queen of a united Netherlands. It did not remain so for long; the Catholic southern provinces resisted the Dutch Reformed north and went their own way to form Belgium in 1831.
According to her Wikipedia article, her marriage was dynastic but it became a love match. Princess Frederika Sophia Wilhelmina was her mother-in-law and Princess Marianne was her daughter.

Queen Wilhelmine of the Netherlands, born Princess of Prussia Frederica Louisa Wilhelmina by ? (location unknown to gogm)

Queen Wilhelmine of the Netherlands, born Princess of Prussia Frederica Louisa Wilhelmina by ? (private collection)
