Darthfanta: Don’t worry; Helena the Younger’s husband brings much more to the table than just a pretty face.
JackExpo: The current Roman possession of the Black Stone will end…eventually. That does not, however, preclude the possibility of the Romans taking it again. Maintaining control of the Red Sea is important to the White Palace and Mecca is not that far away.
Brokenman: I’m planning for an interlude update devoted solely to the New World, although when exactly that will be placed I have not decided. As for ‘First World War’, that is not the contemporary term but one applied after the Peninsular War. View it as if all the historical commentary of the Seven Years War being the first world war was accepted by general practice.
Sh3baproject: Cossack-stan is here to stay. However it may border an independent Xinjiang that never was conquered by China (no Qing dynasty). Although to be honest after the fall of the Timurid Empire Central Asia has fallen off my mental map for the most part.
Swag of the swag: See below. HanEmpire covered most of them and I’ll just a few details here and there.
City populations: Can’t answer that question even close to its entirety. But the largest cities are Beijing (600,000), Vijayanagara (450,000), Constantinople (320,000), Paris (250,000), and Texcoco (225,000). Thessaloniki, Milan, Genoa, Antioch, Guangzhou, Baghdad, and London are all in the 150-170,000 range. In the 120-149,000 range are Palermo, Naples, Rome, Florence, Lisbon, Cordoba, Rayy, and Marselha. In the 80-119,000 range are Smyrna, Nicaea, Messina, Seville, Mbanza Kongo, Alexandria, Sijilmasa, Munich, Hamburg, Lubeck, Cologne, and Malacca.
There are also undoubtedly many Indian, Chinese, and Japanese cities who should also be in the above list, but with my lack of knowledge any selection and population I would make would be purely arbitrary guesswork.
Danube and Vlachs: See HanEmpire’s posts.
Levant: The centers of Greek Orthodoxy in the Levant are Antioch, Aleppo, Tyre, and Acre, which at this point ITTL are as Greek and Orthodox as Smyrna. The area will be a mix with the details undetermined, but more Greek the closer one is to those four cities and to the coast.
Mesopotamia: The area is Turkish-majority north, Arabic-majority south (also Shiite), and mixed center.
Andalus/Maghreb: See HanEmpire’s posts. Carthaginian is a wholly TTL creation and is the lingua franca of northern Tunisia, although the first grammar was written within living memory. Its base grammar and script is Ligurian, with a big helping of Maghrebi Arabic loan words and some Greek. As for Libya, the Romans really couldn’t care less about it. But if they still hold it when oil is discovered that would change drastically.
Egypt: See HanEmpire’s posts.
Russian Far East: It will look similar to OTL. I don’t have the creativity, imagination, knowledge or time to significantly alter all of the world, so areas where my knowledge is limited won’t get a lot of attention and likely won’t see too much change from OTL. I would like to dial back the focus of the TL to center back more on the Roman Empire. It would help from overloading my imagination and help get this TL moving faster. It’s progressed something like 50 TL years in the past calendar year. At this rate I won’t get to the present day before the 2020s.
Japan: Japan is currently divided between whatever the Ainu still hold, the Azai who control Honshu, and the Shimazu who control Kyushu and Shikoku.
Asian colonies: Not going to happen. My Korea idea was not workable and is in the trash bin.
Dalmatia: That is undetermined but HanEmpire’s analysis is accurate.
The rest: HanEmpire covered them.
HanEmpire: Thank you for helping me out here. I appreciate it.
Status of China: It’s a bloody mess. The Zeng control the south, the Tieh are holding out in Sichuan, and the north again answers to a Mongol Khan. The Romans are loving it, and are cozying up to the Khan.
The Romans raided the Tieh incessantly, so relations there are really bad. Relations though with the Zeng are poor (two of the Four Incidents have happened already). The problem with Sino-Roman relations is that both think they are the center of the universe and so get rather irritated with the other. Plus here the Romans are acting like Italians to China’s Byzantium.
Teasers for the next updates:
1) Second half of economic/cultural interlude
2) The Dreams of Demetrios II
5) Strawberry jam and a clot of blood