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I've recently made a post for a TL which had a POD in the 1000s. I've decided to, however, change this to a rival concept I had which goes back to the 500s. The POD is Garmul not attacking Byzantium allowing the Mauro-Roman Kingdom to survive.
So just to start off with, here are some of my own ideas:
Visigothic Spain survives. Maybe taken over by a Frankish adventurer?
During the Sassanid-Byzantine War, the Mauro-Romans take their opportunity and invade Africa not giving Heraclius the chance to save Byzantium.
Khosrau II has Muhammad killed before OTL and thus Islam collapses in on itself with the violence being turned inward rather than outward.
The Arabs being weaker means that the Sassanids weather the migration of divided Arab tribes.
Ethiopia develops into a naval power due to the Muslims never crushing their naval capabilities and due to their need to compete with the Persians for Yemen.
The Mauro-Roman kingdom develops into two cultural zones with one based around Morocco and another around Tunisia.