12 May 1215: John ordered that lands of his enemies should be seized by the sheriffs. Majority of barons stood to one side either not wanting to be involved in the conflict or waiting to see which side gained the advantage.
17 May 1215: A group of barons and rebels quickly gained control of the capital and the citizens of London formed an alliance with the rebels.
The summer of 1215: By summer, Norfolk and Suffolk were under the control of the rebel barons. A rebel army seized the important town of Lincoln, as well as Northampton, Chester and Carlisle. John was now in the position where he had to listen to the barons demands.
15th and 19th of June 1215: John spent most of his time in the safety of Windsor castle and authorised the Magna Carta on the 15th June. On the 19th June John met the rebel Barons, where they performed the act of homage to the King.
24th August 1215: The pope issued a papal bull, declaring the charter shameful and "null and void of all validity forever".
October 1215: John redistributed the lands of the rebel barons to his supporters. The First Barons’ War starts.