Here's a map of the Roman World during early parts of the 13th Century Anarchy. The map here is more detailed, than the other maps I've posted, thanks to the research I've done during the hiatus period of this tl which I was forced to go on due to irl circumstances. I've added some other post-Roman successor states and corrected some of the errors I made on the old map. Some of this research has led me to re-evaluate the direction of where I was going with this tl, and as a result I have a much clearer picture of how to develop this tl, without it breaking plausibility.
I now have a much more clear vision of where exactly I want to end this tl now which probably will occur sometime during the end of what we consider the Renaissance in otl. I might consider doing a sequel after that, or at least a series of epilogues, but right now I'll be focusing on writing towards where I had that end date in mind.
Some of the corrections include that of Trebizond, which whose borders weren't exactly the most accurate. Another correction I added was in the Aegean islands where I drew added in the Duchy of the Archipelago. I also added the areas in Morea that historically were in control of Leo Sgouros who led a resistance against the Crusaders from within his stronghold: the Acrocorinth.
As for the Venice's holdings, I added in Gallipoli which the Venetians did briefly hold, until it was later reconquered by the Empire of Nicaea in otl. I also added illustrated the situation in Crete which the venetians despite being purchasing it from Boniface of Montferrat, only partially controlled as the Eastern and Central portions of the island were held by the Genoese. Venetian Crete was also which was ruled as the Kingdom of Candia was quite unstable as it faced numerous Roman revolts. I also removed Negroponte (Euboea) from Venetian control as this region during the Early 13th Century was actually under the control of Boniface of Montferrat. Bonficace divided the land here among three barons who were sworn to him as their feudal lord. Its for this reason that Negroponte would be referred to as the Triarchy of Negroponte.
I added in the lordship of Rhodes and the Cyclades as that was an other 13th Century Roman splinter state which emerged after the fall of the Constantinople in 1204. It was ruled by Leo Gabalas and nominally swore fealty to the Nicaean Emperors, though it for all intents and purposes was an independent polity with its ruler Leo Gabras adopting the title of Caesar for himself.
Another addition I made was the County Palatine of Cephalonia and Zakynthos. This polity was technically given to the Venetians but they weren't able to really assert control over it until much later. Its ruler after the Fourth Crusade instead, recognized Pope Innocent III as his overlord to legitimize his rule.