Andronikos IV Palaiologos

Born into the fading purple of the Byzantine Palaiologos dynasty, Andronikos IV was a prince whose ambition burned brighter than his loyalty. Appointed co-emperor as a child, his relationship with his father, John V, curdled into a decades-long feud. In 1373, he launched a failed revolt that saw him imprisoned and partially blinded. Yet his thirst for power was unquenched. In 1376, with Genoese and Ottoman aid, he seized Constantinople, imprisoning his father and brother. His three-year reign was a disaster, defined by civil war and the catastrophic decision to cede the fortress of Gallipoli to the Ottomans as payment for their support. This act gave the Turks their first permanent European base, a gift they would never relinquish. Deposed in 1379, he spent his final years ruling a fragment of territory, a living symbol of an empire tearing itself apart. His personal vendetta drained the state's last resources, making the eventual Ottoman conquest of the Balkans not a question of if, but when.