John VIII Palaiologos vs William the Lion

John VIII traveled to Italy with a large delegation of Orthodox clergy to participate in the Council of Florence, which aimed to negotiate church union. His presence underscored the Byzantine Empire's desperation for Western aid.

John VIII Palaiologos, as Byzantine emperor, agreed to the Union of Florence, which temporarily reunited the Eastern Orthodox Church with the Roman Catholic Church under papal authority. This was done to secure Western military aid against the Ottoman Empire, but the union was widely rejected by the Byzantine populace and clergy.

John VIII died embittered, having failed to secure effective Western military support despite the Union of Florence. The Ottoman Empire continued its conquests, and the union deepened internal divisions within Byzantium.

William the Lion was captured by English forces near Alnwick Castle during an invasion of Northumberland. He was taken prisoner to England, leading to the Treaty of Falaise where Scotland became a vassal state of England.

William the Lion signed the Treaty of Falaise, acknowledging Henry II of England as his feudal overlord. Scotland's castles were garrisoned by English troops, and William paid homage to the English king.

William the Lion founded Arbroath Abbey in Angus, dedicated to St. Thomas Becket. The abbey became a major religious center and later the site where the Declaration of Arbroath was drafted in 1320.

William the Lion paid 10,000 marks to Richard I of England to annul the Treaty of Falaise. This purchase restored Scotland's independence and ended English overlordship, with all English garrisons withdrawn from Scottish castles.