Leon. Ketamine. Hmm.

See, this is actually a smart move.

Charles, being an elderly male, could die randomly at any time (especially if he randomly falls out of a window). With the loss of India the English crown lost its Empire rank but not many of the other Commonwealth crowns and that means Emperor Trump can annex all of the kingdoms by pushing Harry’s strong claims generated by Charles’s death, a rare chance to gain an empire’s worth of land without fulfilling bloodline requirements.

Obviously, while you could risk him wandering around on his own it’s much better to put him in house arrest so he doesn’t wander off or get killed “accidentally” on a hunting trip.

Well, if Trump is good at this game, anyways. Noobs sometimes just look for imprisonment reasons to get a 100 ducat ransom instead of paying attention to what heirs are in their realm.