>>520894281
Persians held out til 760s in the north and came back under the buyids, saffarids, qarmatians, samanids and numerous different smaller Persian states and empires, most claiming Sassanid origins. They took down the umayids via abu khorossani, sacked meccah under qarmatians, controlled abasids as puppets under buyids and taharids and killed omar with pirouz aka abu lulu, they then unified under the Safavid dynasty and have been a regional power since. Once each of the Roman empires fell they literally never rose again.