Twenty Years' Anarchy

Byzantine Empire
Βασιλεία Ῥωμαίων
695–717
Roman Empire 717 AD. 1. Ravenna 2. Venetia and Istria 3. Rome 4. Naples 5. Calabria 6. Hellas 7. Thrace 8. Opsikion 9. Thrakesion 10. Anatolikon 11. Karabisianoi 12. Armeniakon. Hatched area: Frequently invaded
Capital		Constantinople
Languages		Greek
Religion		Chalcedonian Christianity
Government
History
•	First deposition of Justinian II	695
•	Deposition of Theodosius III	717
Preceded by Succeeded by Byzantium under the Heraclians Byzantium under the Isaurians
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The Twenty Years' Anarchy is a historiographic term used by some modern scholars for the period of acute internal instability in the Byzantine Empire, marked by the rapid succession of several emperors to the throne between the first deposition of Justinian II in 695 and the ascent of Leo III the Isaurian to the throne in 717, which marks the beginning of the Isaurian dynasty.

Justinian II (685–711) set in motion a chain of events by embarking on a despotic and increasingly violent course. His policies met with considerable opposition, eventually provoking a rebellion led by Leontios (695–698) in 695, which deposed and exiled him, precipitating a prolonged period of instability and anarchy, with seven emperors in twenty-two years.

Leontios proved equally unpopular and was in turn overthrown by Tiberios III (698–705). Tiberios managed to bolster the eastern frontier and reinforced the defenses of Constantinople, but meanwhile Justinian was conspiring to make a comeback and after forming an alliance with the Bulgars succeeded in taking Constantinople and executing Tiberios.

Justinian then continued to reign for a further six years (705–711). His treatment of Tiberios and his supporters had been brutal and he continued to rule in a manner that was despotic and cruel. He lost the ground regained by Tiberios in the east, and imposed his views on the Pope. However, before long he faced a rebellion led by Philippikos Bardanes (711–713). Justinian was captured and executed as was his son and co-emperor, Tiberius (706–711), thus extinguishing the Heraclian line. Justinian had taken the Byzantine empire yet further from its origins. He effectively abolished the historical role of Consul, merging it with Emperor, thus strengthening the Emperors' constitutional position as absolute monarch.

Philippikos' rebellion extended beyond politics to religion, deposing the Patriarch Cyrus, reestablishing Monothelitism and overturning the Sixth Ecumenical Council, which in turn alienated the empire from Rome. Militarily the Bulgars reached the walls of Constantinople, and moving troops to defend the capital allowed the Arabs to make incursions in the east. His reign ended abruptly when an army rebellion deposed him and replaced him with Anastasius II (713–715).