1231
Pope Gregory IX formalizes the Inquisition
By the bull Excommunicamus, Gregory entrusted the hunt for heretics to Dominican friars answerable directly to Rome rather than local bishops. The standardized procedures of inquisitorial interrogation, secrecy, and record-keeping took shape in the tribunals of southern France. The friars' meticulous archives, preserving verbatim testimony from thousands of suspects, are now among the richest sources for medieval social history.
Ogedei sends Chormaqan to pacify Iran
The Great Khan dispatched a Mongol army under Chormaqan Noyan to finish off the remnants of the Khwarazmian Empire in western Iran. Chormaqan established a permanent Mongol garrison at Mughan in Azerbaijan, from which the steppe rulers would administer the Iranian plateau for a generation. His forces systematically reduced the last independent fortresses across Khorasan, bringing the entire region under Mongol governance.
Wolgok Fortress withstands Mongol siege in Korea
During the first Mongol invasion of the Korean peninsula, the fortress of Wolgok held out against repeated assaults, demonstrating that Korean fortification and archery could frustrate Mongol tactics. The lesson encouraged the Goryeo court's decision to retreat to the island of Ganghwa, where no steppe cavalry could follow. The court would remain on its island refuge for nearly three decades, governing the ravaged mainland from across a narrow strait.
Elizabeth of Hungary dies at Marburg
The widowed Thuringian princess, a disciple of Franciscan piety, died at twenty-four after years of serving the sick in a hospital she founded at Marburg. Canonized within four years, she became the patron saint of charity and a model for later royal saints. Her shrine at Marburg drew thousands of pilgrims and became the first purely Gothic church in the German lands.