What would happen if after Justinian conquers Italy, the Byzantines hold onto it without the Lombards invading? How long would it take for Italy to recover from the Gothic War?
I think you need an earlier POD, with a faster and less destructive reconquest of Italy, for the Byzantines to hold on to Italy. Maybe Belisarius accepts the first offer the Goths made - to let them keep Italy north of the Po river as foederati, where they were more concentrated anyway - and that leaves them in place to help out against the Lombards, who might not even invade at all if they know they're going to face heavy resistance.
This leaves peninsular Italy more stable, more populated, wealthier and more capable to support the Empire later on, when the Slavs arrive, as I don't think these invasions would be easily butterflied.
In the long term, I think you end up with a Western Emperor in Rome or Ravenna, set up to coordinate defences in Italy, who then splits up with Constantinople on religious grounds.
Maybe the Emperor keeps Belisarius in Italy and send Narses to the EastMight Belisarius accept this deal if a crisis in the East forced his hand? Suppose Justinian "cuts his losses" and forces Belisarius to head out against the Persians or something?
Eh, it's a gamble. The Germanic confederacies were quite fluid, so one major Frankish victory later you might have the Goths and Lombards as subjects of the Franks-proper to smite the Byzantines together.You know, if southern Italy is securely Byzantine, and northern Italy is a war zone between Franks, Lombards, and Goths, the Byzantines would be well positioned to move in on the north, and all they would have to do is wait a couple decades.
This is a very unlikely scenario, but it's interesting. A female Palaiologos heir marries into another Italian house, and they assert Roman continuity and pursue reuniting the Italian peninsula and environs? Maybe "Roman Sicily" passes to the Montferrat Palaiogos dynasty?Assuming there is a Butterfly net on Historical events outside of Italy, a "Byzantine Sicily" would be the last surviving remnant of the Roman Empire from 1453 (when Constantinople falls) to the Italian Unification wars.
Which would lead to the interesting question of whether to give control of all of Italy to the Byzantine rump state or to the House of Savoy.
Without such a Butterfly net, I honestly don't know what could happen.
Actually Secondotto, Marquess of Montferrat and Maria of Sicily are in the same Age group.This is a very unlikely scenario, but it's interesting. A female Palaiologos heir marries into another Italian house, and they assert Roman continuity and pursue reuniting the Italian peninsula and environs? Maybe "Roman Sicily" passes to the Montferrat Palaiogos dynasty?