A civil war for constitutional reform that weaponized antisemitism to fund a rebellion.
The Second Barons' War was more than a struggle for parliamentary power. While Simon de Montfort challenged King Henry III to rule with a council, he also incited brutal pogroms against Jewish communities. By cancelling debts, he fueled his war effort, leaving a complex legacy of constitutional change and violence.
The Second Barons' War (1264–1267) emerged from deep dissatisfaction with King Henry III’s governance. Barons, frustrated by the King's reliance on foreign favorites and his demands for extra finances, sought to limit his absolute power. In 1258, they forced the King to accept the Provisions of Oxford, which transferred authority to a council of twenty-four barons and mandated a parliament every three years to monitor royal performance.
Simon de Montfort, a French-born Earl who had married the King's sister, emerged as the leader of this opposition. His movement was not merely political; it was deeply intertwined with rising antisemitism. The Crown had long used punitive taxation on Jews, forcing moneylenders to sell debt bonds to royal courtiers. This practice caused many landowners to lose their property, creating a fertile ground for resentment. De Montfort exploited this by promising to cancel debts owed to Jews, effectively using the destruction of financial records as a tool to gain support and fund his rebellion.
The conflict turned violent, with massacres of Jewish communities occurring in cities like Worcester, London, Lincoln, and Cambridge. In London, an estimated 500 Jews were killed. Despite de Montfort’s initial success at the Battle of Lewes in 1264, where he captured the King, his coalition proved brittle. By 1265, Prince Edward escaped captivity, rallied royalist forces, and decisively defeated de Montfort at the Battle of Evesham, where the rebel leader was killed.
The war concluded with the Dictum of Kenilworth in 1266, which offered rebels a path to pardon through heavy fines. While the conflict resulted in an estimated 15,000 casualties, it left an indelible mark on English governance. De Montfort had expanded the social foundations of parliament by including representatives from counties and towns, a move that persisted even after his death. The war remains a stark example of how noble ideals of constitutional reform can be inextricably linked to the systematic persecution of vulnerable populations.
Source: Second Barons' War
