Deleted member 97083
The 800s and 900s saw great fluctuations in Viking, Rus, Abbasid, Bulgarian, and Byzantine power. If all the factors manage to align--the Abbasids avoid or recover from the Anarchy at Samarra, while the Byzantines fall into an iconoclastic chaos--could the Byzantine Empire collapse due to invasions of Vikings, Abbasids, and Bulgarians some time in the 9th or 10th century?