After reading many Byzantine continuation TL I've noticed that all seem to involve either a no Manzikert and no resulting loss of Anatolia OR a reconquista of Anatolia by a later dynasty. Let's change this a little bit.
WI the East Romans lose Anatolia earlier but hang onto the Balkans, which becomes the heart of their Empire. This maybe ASB. I'm thinking of an
Empire consisting of the Balkans, maybe the Nicaean area and maybe some land north of the Danube. Let's discuss!