You are correct in stating that the Slavs are the ancestors of both the modern day Russians and Ukrainians, but you are wrong to state that Ukraine was not a state back in the Middle Ages.
There were (and still are) three main groups of “Russian peoples”: the Great Russians, the White Russians and the Little Russians. The *Russian people today are the main descendants of the Great Russians, the Belorussians are the White Russians (Belo = white ) and the Little Russians are the Ukrainians.
You, @Skadidesu speak of Ukraine as “weren’t a thing back then” but they DID exist. Ask any Ukrainian today, and they will proudly say that they are the Little Russians. The Urkrainian state DID exist back in medieval times, though it was not called “Urkrain” but “Kievan Rus” or “Principality of Kiev”.
ALL THREE Russian groups are classified as “Slavs”.
Photo from “Rise of Russia” TIME-LIFE Books, by Robert Wallace
Which movie are you referring to?
And no, you are wrong to state that the Celts “are a meme”. They were a people that did actually exist. The Ancient Romans wrote much about them. Plus, the Scottish, Welsh, and Irish peoples have had their DNA traced back to the Ancient Celtic peoples. So whatever evidence you are basing your claim on that the Celts are fantasy and not “real”, seems crazy, considering that the Ancient Romans themselves AND modern day historians and genealogists have proven the Celts existed.
As for the Celts civ in Age of Empires 2, why not name the medieval Scots, Irish, and Welsh “Celts”? The Celtic Church (founded in Ireland) was named such during the Middle Ages, which shows that even the medieval Irish themselves acknowledged their Celtic heritage. Therefore, it is perfectly reasonable that the 1999 Age of Empires 2: Age of Kings developers chose such a name to define the medieval Scots, Irish, and Welsh.
I very much know about Eastern Europe. I am a historian, and I have plenty books on my shelves about Eastern Europe. I am also of Finnish blood, so I am familiar with northeastern, and eastern Europe.
I fail to see what claim you are drawing here? The Portuguese and Byzantines have almost nothing to do with each other, except in a small time when the Byzantines under Emperor Justinian I, conquered the southern fringes of the Iberian Peninsula in 5th-6th century AD. But the Portuguese were not even a distinct people yet at that time. The County of Portugal was not founded until 868 AD, and by then the Byzantines were long ousted from the Iberian Peninsula.
I can get around this claim of yours, if you can argue how different a Hussitian/Bohemian civ would be from a Slavs or Teutons one. Teutons civ and Slavs civ already have elements to represent medieval Bohemia.
Big does not automatically mean “they deserve more civs”. If the medieval Chinese were culturally, linguistically, and socially diverse enough from each other, then yes. But the answer is: no, the medieval Chinese were not quite diverse enough back then to warrant separate Chinese civs now, in Age of Empires 2.
If you are talking about the Tibetan peoples then yes! absolutely they can be a “second Chinese civ” though they are not Chinese. Tibet has a unique history compared to China, or Mongolia, or India or Afghanistan which surround Tibet.
But the Chinese civ already covers much of medieval China, north AND south. That is because the famous medieval Chinese dynasties, the Tang, the Yuan (ruled by Mongols, but technically Chinese in organization), and the Ming all ruled north and South China. Even the Song Dynasty, as you mention, had a lot in common with the rest of China.
Sure, there are some regional variations among the Chinese people in dialect, slang, food cuisine and local customs…but these are not enough to make there be TWO Chinese civs.
Not only that, but how the heck would you make the 2nd Chinese civ different enough and unique enough in units, techs, and civ bonuses from the current Chinese civ already in the game?
A few centuries is actually a really long time, considering the span of a average human’s life expectancy of 60-80 years approx. Some of the Chinese medieval dynasties did not last themselves more than a few centuries. Also: the Mongol Empire of Genghis Khan is remarkable in that is stay UNIFID for so long as it did, considering its vast size. One of the things that makes that man so great is that he created a political and military system of succession that prevented Mongol and Tartar lords of great ambition to split the Mongol Empire in civil war.
I recommend that you read the Harper Encyclopedia of Military History by R. Ernest Dupuy and Trevor N. Dupuy to learn on how effective Genghis Khan really was, and how impactful the Mongol Empire was in the world stage.
Hatred does not necessarily mean that they were not related on ethnic terms. The Danes and Swedes used to “hate” each other during the Dano-Swedish Wars of the Early Modern Era, and yet they all came from the same Viking stock. The Welsh and English “hated” each other, and yet are closely link through blood.
The Saudi Arabians, the Iraqis, and the Egyptians all look at each other fearfully and have fought some wars against each other…and yet they all are descended from medieval Arabs, the “Saracens”.