I figured. Shouldn't it be Empire of Romania, which is what contemporaries called it?
Granted, Latin Empire sounds really badass.
Latin Empire was the name of the succesor byzantine state after the 4th crusade. It is the generic vassal name under middle ages France and HRE (I think it is the same under Italy also). It historically accurate.
Empire of Romania never existed as a title. The official title was
Imperium Romanorum which means
Empire of Romans and it was the unvassaled name, not the vassaled.
Other names include:
Empire of Nicaia: When the capital isn't Constantinoupolis.
Empire of Trapezounta: When the capital is in Trebizon (north Anatolia)
Empire of Epirus: When the capital is in Balcans.
However, if Byzanitum becomes vassal of HRE, then HRE would reclaim the "only succesor state or Roman Empire". So HRE should be "Holy Roman Empire" (even if it controls only one city) and Byzantium should be "Province of Byzantion".
Byzantium can represent modern day Romania if it controls only the Balcan Danube region. If the capital is in Greece it should be
Rumelia and if it is a vassal of Seljuks it should be
Sultanate of Rum.
If it is in the industrial era or later and the capital is in the anatolia it should be called
Pontus (
Pontic Republic, Pontic Junta if fascist and so on).
Ok, let's summarise:
Polities (depend on capital location):
If Capital is Constastinoples it is
Byzantium(western civs)/
Rum(eastern civs).
If state religion is Islam then it is
Rum.
If capital is in north anatolia then it is
Pontus (
Empire of Trebizond can be percieved as the first Pontic state).
If capital is in north anatolia and has more than two cities (Pontic empire) it is
Pontus-Armenia
If capital is in south anatolia then it is
Nicaea.
If Capital is in Greece then it is
Rumelia.
If Capital is in Danube then it is
Romania
Vassal names of Byzantium:
Frankish/HRE:
Latin Empire
Turkish/Mongol/Mughal/Iranian:
... of Rum.
Vassal names of Rum: as usual
Vassal names of Pontus: as usual
Vassal names of Pontus-Armenia: as usual
Vassal names of Rumelia:
European monachy/theocracy: Duchy of (the name of the capital, usually Athens)
Others: as usual
Vassal names of Romania: as usual
Vassal names of Nicaea: as usual
Not a vassal (depents on civics):
Dynastic not empirial names:
Byzantium/Rum:
Despotate of Contastinopolis
Pontus:
Despotate of Trebizond
Nicaea:
Despotate of Nicaea
Rumelia:
Despotate of Morea
Romania:
Despotate of Epirus
Theocracy and empirial names:
Byzantium:
Byzantine Empire (official
Empire of Romans)
Rum:
Empire of Rum
Pontus/Pontus-Armenia:
Empire of Trebizond
Nicaea:
Empire of Nicaea
Rumelia:
Empire of Morea
Romania:
Empire of Epirus
Autocratic names:
Byzantium:
Byzantine Junta
Rum:
Junta of Rum
Pontus:
Pontic Junta
Pontus-Armenia:
Pontic-Armenian Junta
Nicaea:
Junta of Nicaea
Rumelia:
Rumelian Junta
Romania:
Romanian Junta
Republican names:
Byzantium:
Byzantine Republic
Rum:
Republic of Rum
Pontus:
Pontic Republic
Pontus-Armenia:
Pontic-Armenian Republic
Nicaea:
Republic of Nicaea
Rumelia:
Rumelian Republic
Romania:
Romanian Republic
Communist names:
Byzantium:
Democratic Republic of Byzantium
Rum:
Democratic Republic of Rum
Pontus:
Democratic Republic of Pontus
Pontus-Armenia:
Democratic Republic of Pontus and Armenia
Nicaea:
Democratic Republic of Nicaea
Rumelia:
Democratic Republic of Rumelia
Romania:
Democratic Republic of Romania
Byzantium should not collapse after the conquest of Constantinople so that all these polities can be into existence.