King John affixed his seal to the Magna Carta at Runnymede in June of this year
... At some point, 
probably on June 19, King John put his seal on the final draft of what we call 
today "Magna... [DOC] [TLE] The History of the Magna Carta, 1215 - Historic UK [PAR] The importance of Magna Carta and the signing by King John in 1215.