Do you think, after checkmate, the enemy king is kidnapped or killed?

This thread isn't about actually playing chess, more to do with the "story" behind it.

I was doing some reading wondering why pieces are always captured (as opposed to killed) and interestingly when chess was invented (in India approx 2000 years ago) people were often kidnapped and held to ransom. And hence when chess was invented the idea was that captured pieces wouldn't be harmed because they would be held to ransom. Which I presume would mean at the end of the game the winning side is able to free all their captured pieces.

When the king is checkmated, the curtain falls and we don't see what happens next. But what would have happened (say 2000 years ago in India) if during a real-life battle one side captures the enemy king? I would imagine (after any interrogations) he would be executed to get him permanently removed, and all his subjects would be forced to pledge alliance to the winning side's queen?

Anyone have any thoughts on this?

After checkmate usually we just set them back up on e1 and e8.

You've never heard of "a king's ransom" ?

After checkmate, the enemy King is sent to a re-education camp.

Dont make fun of the public school system.

Or a sanctuary city, if it got offended over being captured.

I'd say exile, like Napoleon. Victorious kings are always afraid of turning tables.

Well it is widely accepted that the word 'checkmate' is derived originally from Persian 'sah mat' meaning 'the king is dead'. 

IMO it is killed because in some places you can actually take the king if your oponent ignores a check and plays an illegal move.

"Killing" is not appropiate. The "nice" term would be "sent to a party with all of the other pieces that have been "partynized"".

The King is not killed, but must commit suicide. That is why we turn the king on its side, to symbolize that event.

+1 about the Persian phrase I've heard too. 

However, what about in quiet tournament halls where talking is discouraged (even "check" or "checkmate" not necessary)? Perhaps then the winning side is merciful and the opposing King lives?

Then again, it is checkmate regardless of the "opinion" of the enemy king, that wouldn't make sense if you execute it (you can merely halt the execution), if the checkmated king suicides then the enemy king has no say on what happens.

Neither,the King is sacred.

Some goons just rough him up a little and dump him out of a car in a strange place.

Oh, get her!