Why was the Magna Carta reissued in 1216 under Henry III?

The Magna Carta was reissued on November 12, 1216, shortly after the death of King John, by the council of his young successor, Henry III.1

At the time, England was embroiled in a civil war, and Prince Louis of France (later Louis VIII) was attempting to seize the throne with the support of rebellious English barons. The primary motivation for the council’s reissue was to recall these men to their allegiance to the young, rightful king.12

To make the document more palatable and to protect the crown's interests during the conflict, the council significantly shortened the 1215 version. They omitted clauses that were purely temporary or political, as well as those that might have restricted the government's ability to raise the necessary funds or forces to continue the war. While the 1216 charter maintained the goal of providing a definitive statement of feudal law, controversial or restrictive provisions were postponed for future consideration.1