[Squirrelloid]

Ok, i loaded it up. Assuming there's a 1:1 mapping of commanders to unique heroes (not actually true, if a hero has an alternate form, it has 2 versions present), there are 149 heroes in the game as loaded with the Black Heroes map. There are 68 nations.

149/68 = ~2.19 heroes/nation

Note this is an overestimate, because i know i overcounted heroes by occasional double-counting. This also counted multi-heroes (but only once unless there is a multi-hero with an alternate form).

Having looked at the heroes, i think it does include WH.

Now, I can't give you a list of which heroes belong to which nation without going through the whole list and trying to figure out which nation they belong to. Some heroes are more obvious than others, and in some cases its hard to figure out if a hero belongs to a particular era, and some are just strange (There's a sauromancer hero for a non-C'tis nation, for example and iirc).

Mod/Map is BlackHeroView.map