Signing of the Magna Carta By bgodley7 May 27, 1209 King John becomes excommunicted from the Chruch By pope Innocent the 3rd. Jan 27, 1210 King John's taxation was becoming overwhelming May 27, 1214 Loses in France This caused the King to search for more ways to gain taxes. Jan 27, 1215 The Barons wrote a letter to King John about the unfair treatement they were recieving Jun 19, 1215 Signing of the Magna Carta