For the future of the game, you can enter a lot of fighting factions (like in the Siege) starting with 10 and ending with the 12th century. (Just to know how the Knights were in the 12th century, the Vikings in the 11th century).
So there you go:

Wars of Ancient Rus (Slavic warriors)



This Hercules of ancient Russia




Wars of Ancient China







Roman Warriors



If possible, I will supplement the topic.
But if you want, you also add the ancient warriors that you think you can enter the game in the future.