The Battle of Lewes on 14 May 1264 was the most decisive engagement of the Second Barons War. Simon de Montfort's baronial army descended from the South Downs and caught the royalists unprepared on the slopes below Lewes. Prince Edward's cavalry routed the London contingent but then pursued too far — when he returned the battle was lost. Henry III surrendered at the Priory of St Pancras. The Mise of Lewes established de Montfort's effective government of England and led directly to the Parliament of 1265, often cited as a foundation of English parliamentary government.
Significant royalist losses; king and prince captured
This battlefield is listed on the Register of Historic Battlefields — a national designation identifying Britain's most significant battle sites for protection and further research. Reference: Registered Battlefield (Historic England).
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