A royal riddle is:
       
Q: What happens to deposed kings?
A: They get throne away.
       
“Throne away” is a pun on “thrown away.” The riddle was posted on the newsgroup rec.humor on August 13, 1993.
     
“@funnyoneliners: Deposed kings get throne away” was posted on Twitter by Barbara Griffith on February 11, 2012. “Deposed kings get throne away” was printed in the book 5,000 Sidesplitting Jokes and One-Liners (2013) compiled by Grant Tucker.
   
       
Google Groups: rec.humor 
List of “Hot Cross Puns”, and more
Harold Reynolds
Aug 13, 1993, 10:10:54 AM
(...)
What happens to deposed kings? They get throne away.
     
Google Groups: rec.humor
Canonical List Of Language Expressions Humor 3/4
Stuffed Turkey
Nov 23, 1993, 8:51:49 AM
(...)
What happens to deposed kings? They get throne away.
 
Twitter
FunnyOneLiners
@Funnyoneliners
What happens to deposed kings? 
They get throne away.
10:01 AM · Feb 12, 2010·Twitter Web Client
         
Twitter
Hennesys Hernández
@Hennesys_Herdz
hahahahahahahahahahahaha——>>”@funnyoneliners: Deposed kings get throne away.”
8:52 AM · Feb 11, 2012·Twitter for Android
   
Twitter
Barbara Griffith
@Barb_Griffith
“@funnyoneliners: Deposed kings get throne away.”
8:54 AM · Feb 11, 2012·Twitter for iPhone
 
Google Books
5,000 Sidesplitting Jokes and One-Liners
Compiled by Grant Tucker
New York, NY: Skyhorse Publishing
2013
Pg. 181:
Deposed kings get throne away.
   
Google Books
Best Ever Classroom Jokes:
Because some of us never grow up
By Mike Haskins
London, UK: Pavilion Books
2015
Pg. ?:
What happens to deposed kings?
They get throne away.
 
15 March 2016, The Telegraph (London, UK), “A history of the world in funny puns,” pg. ?:
What happens to deposed kings? They get throne away.
     
Twitter
PaladinDad
@Paladin_Dad
When deposed kings get THRONE away it’s not their CROWNING achievement. They get ROYALLY screwed #DungeonsAndDragons
8:52 AM · Apr 27, 2016·Twitter for iPhone
 
Reddit—Jokes
Posted by u/[deleted] October 20, 2016
What happens to deposed kings?
They get throne away.
COMMENTS
PilotPengu
This is the crowning achievement in your career of puns.
   
Google Books
Really Bad Dad Jokes:
More Than 400 Unbearable Groan-Inducing Wisecracks s Sure to Make You the Funniest Father With a Quip
By Joe Kerz
New York, NY: Simon & Schuster
2019
Pg. 59:
50.
What happens to deposed kings?
They get throne away.
 
Reddit—Dadjokes
Posted by u/Bakedschwarzenbach May 17, 2019
What happens to deposed kings?
They get throne away!
 
Reddit—Teenagers
Posted by u/INeedHealth February 27, 2021
What happens to deposed kings?
They get throne away.