John VIII Palaiologos vs Peter I of Cyprus

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.

Peter I captured the city of Adalia (Antalya) on the Anatolian coast from the Hamidid Turks. This victory gave Cyprus a foothold in Asia Minor and boosted Peter's reputation as a crusader king.

Peter I traveled across Europe to promote a new crusade, visiting Avignon, Paris, and London. He secured promises of support from Pope Urban V and various monarchs, though the actual military response was limited.

Peter I led a Crusader fleet to Egypt and sacked the city of Alexandria. The attack was a brutal raid that resulted in massive destruction and loss of life, but failed to hold the city or achieve lasting strategic gains.

Peter I was assassinated in his bed in Nicosia by a group of Cypriot nobles. The murder was motivated by his heavy taxation, autocratic rule, and the financial strain of his crusading campaigns.