DBWI: A Unified Arab Empire?

The Byzantine-Sassanid war of 602-628 was a devastating conflict for both nations involved. The Byzantines took quite some time to recover, and the Sassanid Dynasty's days were numbered. At the same time, various fringe territories of these two empires got picked off by various migrating Arab groups, who spread their language family to various small parts of the Middle East. What if, instead of just a few scattered warlords, the Arabs had been united somehow into a single empire. Given competent generals and decent luck, how well might this empire have done against the reeling Byzantine and Sassanid Empires at this time?
 
How would a scattered group of tribes create an empire? especially surrounded by the most powerful empires the world has ever seen. If some how they did manage to conquer the Byzantines or Sassanids I assume they would just adopt the culture of the empire they conquered. So although it would be ruled by 'Arabs' it would be a Greco-Roman or Persian Empire in every meaningful sense.
 
The region was home to desperate bands of nomads until oil was found in there only what, a century ago? Until then everything from the Tigris to the Indus and south of the Aral Sea spoke Persian. These people stayed united enough to drive out the Mongols at the Battle of Khoraszan for heaven's sake. How you think one of the longest running dynasties in the history of mankind can fall because a few tribal warlords unite is beyond me.

And look at the Byzantines, their hold on the eastern and eventually central Mediterranean lasted a thousand years afterwards until the Succesion wars created the half-dozen or so successor states running from Lisbon to Lebanon. And even today the Imperial "Remnant" controls Anatolia, Italy, and the whole of the Balkans to the Danube! It took the whole of Europe arrayed against them AND a four-way civil war to force Iberia, Carthage, Mareutania, Aquitania-Provence/Southern Gaul, Helvetia, Levantania, and Caerenica-Aegpytos from the Imperial grasp!

Come on, even today these are among the half-dozen major powers in the world, and you think that empires lasting over two millenia would fall so easily to bands of tribal nomads who were outnumbered, undisciplined, and commanded by guys under religious fervor? Really?!
 
The region was home to desperate bands of nomads until oil was found in there only what, a century ago? Until then everything from the Tigris to the Indus and south of the Aral Sea spoke Persian. These people stayed united enough to drive out the Mongols at the Battle of Khoraszan for heaven's sake. How you think one of the longest running dynasties in the history of mankind can fall because a few tribal warlords unite is beyond me.
But they did fall, in 672, into civil war and chaos that did not end until the Mezrahid dynasty was established 24 years later. During this time, they lost their territory on Arabia itself to the Arabs, could it not be possible for the next dynasty to have been Arab?
And look at the Byzantines, their hold on the eastern and eventually central Mediterranean lasted a thousand years afterwards until the Succesion wars created the half-dozen or so successor states running from Lisbon to Lebanon. And even today the Imperial "Remnant" controls Anatolia, Italy, and the whole of the Balkans to the Danube! It took the whole of Europe arrayed against them AND a four-way civil war to force Iberia, Carthage, Mareutania, Aquitania-Provence/Southern Gaul, Helvetia, Levantania, and Caerenica-Aegpytos from the Imperial grasp!
I'm not talking about them challenging the Byzantines in 789 under Constantius, I'm talking about them attacking shortly after the war when the Byzantines were very weak.

[/quote]Come on, even today these are among the half-dozen major powers in the world, and you think that empires lasting over two millenia would fall so easily to bands of tribal nomads who were outnumbered, undisciplined, and commanded by guys under religious fervor? Really?![/QUOTE]But what if the nomads united, giving them more numbers, and became more disciplined?
 
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