Alexander Jagiellon vs Louis VIII of France

Alexander Jagiellon, as Grand Duke of Lithuania, fought a war against Ivan III of Muscovy. The conflict ended with the Truce of 1503, which ceded significant Lithuanian territories to Muscovy, including Chernigov and Starodub.

Alexander Jagiellon signed the Union of Mielnik, which attempted to create a closer union between Poland and Lithuania. The agreement was never fully implemented but represented an early effort to formalize the relationship between the two states.

Alexander Jagiellon was crowned King of Poland following the death of his brother John I Albert. His reign was marked by conflict with the Polish nobility, who sought to limit royal power through the Mielnik Privileges.

Alexander Jagiellon was forced to grant the Mielnik Privileges, which gave the Polish Senate significant control over royal decisions. This weakened the monarchy and strengthened the nobility's political influence.

Louis VIII led a French invasion of England at the invitation of English barons rebelling against King John. He was proclaimed King of England in London but failed to consolidate control after John's death and the barons' shift of allegiance to Henry III.

Louis VIII signed the Treaty of Lambeth, formally abandoning his claim to the English throne. He renounced his invasion and received a financial settlement, ending the First Barons' War and securing peace between France and England.

Louis VIII led a royal campaign in the Albigensian Crusade against the Cathars in southern France. He captured Avignon and several strongholds, extending Capetian authority into Languedoc, but died before completing the conquest.