The Probert Encyclopaedia of Warfare

BARONS' WAR

The Barons' War occurred following the signing of the Magna Carta from 1215 to 1217, with many barons, led by Simon de Montfort, still defying King John, and some offered the crown to Prince Louis of France. After the death of John, the barons' army supported by the French was routed at Lincoln in May 1217, and the war ended by the Treaty of Kingston-on-Thames signed in September 1217.
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