King John of England died, leaving Isabella a royal widow.
King John of England's death on October 19, 1216 marked Isabella of Angoulême's transition from a reigning Queen consort to a royal widow. Her husband's passing ended her active political role in England, as her influence diminished amid the ensuing regency during the minority of her son, Henry III. With political power waning in England, Isabella returned to France, where she sought to regain her own status and assert her territorial rights.