WI: Garmul Never Killed

In OTL, Garmul was killed in 577 resulting in the destruction of the Mauro-Roman Kingdom. What if in another world, Gennadius was assassinated before causing too much damage but enough to cause Garmul to end his hostilities to Byzantium due to fear of further retaliation. With this resulting in Khosrau II destroying the Byzantine Empire and Islam whilst Muhammad was alive, how would the world change?

INITIAL CHANGES:
- Mauro-Roman Kingdom survives
- Byzantine Empire destroyed by Khosrau II
- Muslims strangled in the cradle with Muhammad killed by the Sassanids.

I will be starting a TL some time in mid-November so ideas of things that would be interesting to see are welcome!
 
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