Key term for Edexcel GCSE History, used in King John’s Downfall.
A civil war (1215–1217) triggered by King John's rejection of Magna Carta, leading rebel barons to invite a French invasion.
First Barons' War appears in Edexcel GCSE History revision content for The Reigns of King Richard I and King John, especially King John’s Downfall and England in 1216.
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