At the urging of Simon de Montfort, Henry III was obliged to call a Parliament at Oxford in 1258. For the first time, a commoner (Simon's brother Peter de Montfort) presided over the proceedings, in a forerunner of the modern role of the Speaker. This Parliament forced the king to accept the "Provisions of Oxford", which insisted on the implementation of the terms of the Magna Carta of 1215, as well as establishing a Council of fifteen men to take part in government. This was not sufficient to calm the power struggle between Henry III and Simon de Montfort, however, as war broke out between their two factions in 1263.
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Citation: Editors, Litencyc. "Establishment of House of Commons". The Literary Encyclopedia. First published 31 July 2012 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=354, accessed 23 November 2024.]