It's completely different all over.
Bretonnia is ~12th-14th Century, Empire is ~15th-17th Century. The Norse are distinctly Dark Age, pre-9th Century, while the Albion peoples are roughly described as neolithic with a semi-trogloditic attitude. The Estalian's were not capable of pushing out the Arabyan's, which is akin to the period of the Crusades and the relevant era or southern spain - so ~11th Century, while Tilea is around ~12th-15th Century.
Then there's the other races, such as the Classical Era Remas Republic, Khyprian Empire, and the pre-Sigmar tribes.
Nippon is based on the Samurai, and as the typical samurai is Warring States Japan, that makes the obvious fit.
Cathay is based on the Dynasties, which are fairly unbroken, following the defeat of the Mongol tribes in the Chinese mainland.
So, you've got a general period of 900 AD to 1700 AD.
The general consensus is;
Ashigaru Pikes and Bows = State Spears and Bowmen
Samurai = Greatswords/Halberds
Samurai Matchlocks - Handgunners
Yari Samurai - Lance Knightly Orders
Mounted Samurai - Great Weapon Knightly Orders
Rocket Batteries - erm... the Volley Gun
If you don't like that era, then you can always go earlier.
For example, I don't like the Dynasties of China for Cathay, I much prefer the Three Kingdoms.
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