Marie Antoinette, queen of France was imprisoned for over a year between August 1792 to October 1793 before being executed. Her own side of the family and relatives were also aristocratic, supposedly with armies of their own. Why were no negotiations or invasions attempted to rescue her during her imprisonment, especially after her husband was executed?
There's more that could be said by some of our French Revolution flairs, I'm sure, but I've addressed this previously in a follow-up to a broader answer on a day in the life of Marie Antoinette!