Proclamation of John VI Kantakouzenos as Emperor

John VI Kantakouzenos was proclaimed Byzantine Emperor, marking the formal beginning of a significant civil war in Byzantium. This proclamation occurred amidst a power struggle that followed the death of Emperor Andronikos III. John VI, a prominent noble and former regent, sought to claim the throne against rival factions led by powerful aristocrats and the patriarchate, ultimately igniting a series of conflicts within the Byzantine Empire's political landscape.