Today in the Middle Ages: May 22, 1216

On May 22, 1216, French troops entered England by invitation in the First Baron's War, a rebellion ignited by King John's refusal to follow some provisions of the Magna Carta.

Prince Louis, son of the King of France, was conducted to London by the rebelling English barons and there proclaimed King of England, though not actually crowned. The conflict quickly became a general war over the succession, during which both Louis beseiged both Dover and Windsor Castles.

The war fizzled after John's death in October 1216, when his loyalists won back the rebels by crowning John's 9-year-old son Henry. Henry's regent reissued the Magna Carta with some amendments and the English turned upon their French allies, who were quickly defeated.