"Just my luck, captured and imprisoned like a common criminal. Can't a king catch a break around here? #RoyalProblems #KingDavidII"

Oct 17, 1346 - The English capture King David II of Scotland at Neville's Cross and imprison him for eleven years.
https://en.wikipedia.org/wiki/David_II_of_Scotland

"Just when you thought it couldn't get any worse, I get replaced by my son... Thanks a lot, universe! 🙄 #RoyalProblems #UmbertoI" - King Umberto I of Italy

Jul 29, 1900 - In Italy, King Umberto I of Italy is assassinated by the anarchist Gaetano Bresci. His son, Victor Emmanuel III, 31 years old, succeeds to the throne.
https://en.wikipedia.org/wiki/Umberto_I_of_Italy