King John

King Philip II of France conquered Normandy from King John. John's failure to defend the duchy resulted in the loss of the ancestral lands of the English crown in France. This shifted the focus of English kings toward consolidating power in Britain.

Pope Innocent III placed England under interdict after John refused to accept Stephen Langton as Archbishop of Canterbury. Church services were suspended across the kingdom. John retaliated by confiscating church property, deepening the conflict with the papacy.

Rebellious barons, angered by John's refusal to abide by Magna Carta, invited Prince Louis of France to claim the English throne. John fought a series of campaigns across England. The war continued after John's death in 1216, ending with the Treaty of Lambeth in 1217.

King John sealed Magna Carta at Runnymede after negotiations with rebellious barons. The charter limited royal authority, established due process, and guaranteed certain legal rights. It became a foundational document for constitutional law in England and later globally.