King John 
  King John.
Reigned 1199-1216.  
See 
wikipedia.
Lord-Lieutenant of Ireland ("King of Ireland") 1177-1184.
 
He
succ 1199.
The play 
  King John  
 
by 
 Shakespeare
 spans 1199-1216.
 
He 
mar 1200 to 
  Isabella Taillefer  
[descendant of  
 Charlemagne].
 
He 
ordered erection of 
Dublin Castle
 1204.
 
Built 
King John's Castle, Limerick
 
 c.1210. 
He was 
forced to sign the 
Magna Carta
 1215.
 
He died 1216.
He was  buried  before the High Altar in 
 
Worcester cathedral.
 
He had issue by Isabella:
 
-    Henry III, born 1207, 
 
 
reigned 1216-1272.
 
King John  also  had illegitimate issue:
  - Richard FitzRoy,
mar  Rohese de Dover [dau  of Fulbert de Dover],
   had issue:
  -  Isabella  de Dover,
mar Maurice de Berkeley
and had issue.
 
 -  Lorette de Dover,
mar  William Marmion, 2nd Baron Marmion of Winteringham,
   had issue:
  -  John Marmion, 3rd Baron Marmion of Winteringham,
 had issue:
  -   John Marmion, 4th Baron Marmion of Winteringham, 
mar Maud Furnival,
   had issue:
  -  Joan Marmion, 
mar Sir John Bernake,
   had issue:
  -  Maud Bernake,
 mar
Ralph de Cromwell, 1st Baron Cromwell,
   had issue:
  -  Maud Cromwell,
mar 
Sir William Fitzwilliam
and had issue.
 
 
 
 
 
 
 
 
King John (died 1216)
was  buried with an effigy  in 
Worcester Cathedral.
This is the earliest royal effigy in England
(earlier ones in France).
  
King John's tomb in Worcester Cathedral.
From a guide to Worcester Cathedral, around late 1920s. 
See  
full size.
See  
 cover.
 

King John's tomb in Worcester Cathedral.
From Andrew Kelsall.
See Andrew J. Kelsall Photography.
Used with permission.
See other shot
from Andrew Kelsall.
Used with permission.

King John's tomb in Worcester Cathedral.
See full size.
From here.
See another shot
from Tom Ritchie.
See terms of use.
See more
Flickr images.
 

Effigy of King John on his tomb in Worcester Cathedral.
See full size.
From here.
Drawing of the above effigy of King John in Worcester Cathedral.
From A Student's History of England
 by Samuel Rawson Gardiner (1916).
See here.
Originally from Stothard's Monumental Effigies.
See also a 
  cast of the effigy 
at the
Victoria and Albert Museum.
 
-  Contacts with the Islamic world:
-  
 In 1213, King John  sent an ambassador  to  Morocco
to make contact with  the court of
 Almohad Caliph 
Muhammad al-Nasir.
 The aim  was to  secure the Almohads'  support in England's conflicts with European enemies.
 -  The contemporary chronicler
 Matthew Paris,
writing in the mid 1200s,
said that  
King John   offered to convert England to Islam
in return for aid.
 
There is no solid  evidence for this story though.
 
 -  Robin Hood:
- 
King John  is often cast as the villain in the stories of
Robin Hood.
The first mention of the stories of Robin Hood
is in the 1370s.