I'm honestly surprised to see that this PoD seems to be so rarely discussed; the majority of threads are about iconoclasm completely succeeding, sometimes even in Western Europe. But anyway:
Suppose Leo III Syrus is successfully overthrown during his reign, either by Agallianos Kontoskeles in 727 or by Petasius Tiberius in 729/30/31. Both had a vested interest in reverting iconoclasm. Iconoclasm was deeply unpopular in the empire, sparking countless revolts; even after Leo Syrus, these continued, and his successor Constantinus V was frequently called "The Dung-Named" (Copronimus) or even "The Filth" (Cabbalinus) because of it.
Iconoclasm heavily deteriorated ties with the Papacy in Rome, and was eventually one of the factors in the Pope deciding to crown Charlemagne and thus establish the HRE. The other factor, next to the Eastern emperors not giving a shit about defending Italy anymore, was the overthrowal of Constantine VI by his mother Irene -- a woman, thus unacceptable to the Pope. With Leo III overthrown, Constantine VI's existence and Irene's usurpation are both butterflied.
Put simply, removing iconoclasm subsequently removes the Holy Roman Empire as well.
If iconoclasm is thus sniffed out completely and permanently, and Irene's usurpation is butterflied by the deposition of Leo's dynasty, what effects does all this have on both the ERE and on Western Europe?
Bonus PoD: If Agillianos's revolt succeeds and Cosmas is installed as emperor, then the Exarchate of Ravenna will most likely still collapse. However, if Petasius takes the throne instead, matters could be very different. Petasius was almost certainly a Latin speaker, hailing from one of the last areas in the ERE where Latin was still spoken. Additionally, Petasius was, as said, from Italy. Could his successful enthronement lead to the ERE making more of an effort to hold Italy and fight the Lombards? Subsequently, could this lead to Latin obtaining an additional lease on life in the empire? Leo Syrus is still attested with the name "Flavius Leo" in certain sources, meaning Latin likely persisted in a small amount of imperial traditions (and on solidi) as well.
I figured making a new thread for Petasius's rebellion could be largely duplicative, since regardless of whether Petasius is the one who becomes emperor or not, the core will remain the same: No Syrians / Isaurians, no iconoclasm, no HRE. So I figured one thread for one PoD with a fork in the road would be better.
Suppose Leo III Syrus is successfully overthrown during his reign, either by Agallianos Kontoskeles in 727 or by Petasius Tiberius in 729/30/31. Both had a vested interest in reverting iconoclasm. Iconoclasm was deeply unpopular in the empire, sparking countless revolts; even after Leo Syrus, these continued, and his successor Constantinus V was frequently called "The Dung-Named" (Copronimus) or even "The Filth" (Cabbalinus) because of it.
Iconoclasm heavily deteriorated ties with the Papacy in Rome, and was eventually one of the factors in the Pope deciding to crown Charlemagne and thus establish the HRE. The other factor, next to the Eastern emperors not giving a shit about defending Italy anymore, was the overthrowal of Constantine VI by his mother Irene -- a woman, thus unacceptable to the Pope. With Leo III overthrown, Constantine VI's existence and Irene's usurpation are both butterflied.
Put simply, removing iconoclasm subsequently removes the Holy Roman Empire as well.
If iconoclasm is thus sniffed out completely and permanently, and Irene's usurpation is butterflied by the deposition of Leo's dynasty, what effects does all this have on both the ERE and on Western Europe?
Bonus PoD: If Agillianos's revolt succeeds and Cosmas is installed as emperor, then the Exarchate of Ravenna will most likely still collapse. However, if Petasius takes the throne instead, matters could be very different. Petasius was almost certainly a Latin speaker, hailing from one of the last areas in the ERE where Latin was still spoken. Additionally, Petasius was, as said, from Italy. Could his successful enthronement lead to the ERE making more of an effort to hold Italy and fight the Lombards? Subsequently, could this lead to Latin obtaining an additional lease on life in the empire? Leo Syrus is still attested with the name "Flavius Leo" in certain sources, meaning Latin likely persisted in a small amount of imperial traditions (and on solidi) as well.
I figured making a new thread for Petasius's rebellion could be largely duplicative, since regardless of whether Petasius is the one who becomes emperor or not, the core will remain the same: No Syrians / Isaurians, no iconoclasm, no HRE. So I figured one thread for one PoD with a fork in the road would be better.