WI: No plague of Justinian

Let's say that the original person who first had the Plague of Justinian, whether it's Yersina Pestis, in the form that caused the Black Death, some other strain now extinct, or an entirely different pathogen, dies before he or she can pass it on to another person. let's say that it doesn't spread to Europe and the middle east. What happens?
  • What effect does this have on the Anglo-Saxon conquest of England? Do the Roman-Britons survive? Do we see a three-tiered society, with the Anglo-Saxons on top, the Roman Britons in the middle, and the full britons at the bottom of the heap?
  • How does this effect the conquests of Justinian? Does he continue campaigning in Visigothic Spain and the south of France?
  • What effect does this have on the Arab conquests? Does the lack of a plague give the Byzantines and Persians the ability to resist the Arab invasion, even if a Mohammad-analogue appears?
 
Let's say that the original person who first had the Plague of Justinian, whether it's Yersina Pestis, in the form that caused the Black Death, some other strain now extinct, or an entirely different pathogen, dies before he or she can pass it on to another person. let's say that it doesn't spread to Europe and the middle east. What happens?
  • What effect does this have on the Anglo-Saxon conquest of England? Do the Roman-Britons survive? Do we see a three-tiered society, with the Anglo-Saxons on top, the Roman Britons in the middle, and the full britons at the bottom of the heap?
  • How does this effect the conquests of Justinian? Does he continue campaigning in Visigothic Spain and the south of France?
  • What effect does this have on the Arab conquests? Does the lack of a plague give the Byzantines and Persians the ability to resist the Arab invasion, even if a Mohammad-analogue appears?

There have been some threads before about this IIRC, but I think that the Byzantines will be in a moderately more stable place. I doubt they'll be going further into Spain- they already are stretching themselves with Italy, and eventually someone will get Justinian to notice that fact.

The lack of plague might mean that the Romano-Sassanid wars are all the more devastating, so hard to tell there, however, as both states would have more strength to fritter away.
 
Regarding the Anglo-Saxon/Briton conflict, a very excellent timeline called Britons Triumphant seems to be one way the British Isles could turn out; the native Britons eventually being consolidated and banding together against the Saeson, who become relegated to a small collection of petty kingdoms on the eastern shore (how's THAT for role reversal?), and Viking Jorvik not lasting much more than a century.

On the other hand, the idea of a surviving Romano-Briton culture surviving in conjunction with the Anglo-Saxons is also intriguing. Perhaps something resembling this TL could arise, with the Britons keeping their heads above water politically whilst being Latinized in a similar manner to the French and Spaniards (albeit in their own unique way).
 
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