Et Achaici Varangian (The Varangian League) is an ATL based on if the Varangian Guard took over the Byzantine Empire after a rebel general tries to take over but fails.
The point of divergence is May 6th, 1097, when Alexius I is killed in the Siege of Nicaea by a stray arrow. A rebel uprising occurs in Thrace, and they quickly march toward Constantinople. The Varangian Guard pulls out of Nicaea, and with the help of other Crusaders, is able to stop the rebels and install their own Emperor for a transitional government. Unfortunately, Byzantine nobility tried to take power as John II was only nine. Eventually, the Varangian Guard is left the last defender of Rome.