When the campaign had begun, baronial enemies of the unpopular English king John had flocked to the French banner, but after John's death in 1216, and his replacement by a regent, William Marshal, on behalf of John's young son and successor, Henry III, many had switched sides.
Subsequent defeats at Lincoln in May 1217 and at Dover and Sandwich in August 1217 forced Louis to negotiate.
[2] It is known that negotiations were spread over several locations, opening on 6 September 1217 at Staines, because the royal court was nearby at Chertsey or possibly on 5 September on an island of the Thames near Kingston.
The principal provisions of the treaties were an amnesty for English rebels.
[7] Louis undertook not to attack England again and agreed to renounce his claim to the English throne, in exchange for 10,000 marks.