Question about morale of HUMAN army

[Jamers]

I'm trying to get the morale bonus from having an army of five human troops, but it seems that the units I thought belonged in that category don't quite fit as I expected them to. My army is:

knights
swordsmen
bowmen
guardsmen
priests

I tried this earlier with peasants in place of guardsmen and that didn't give a bonus either.

Exactly which units actually count under the 'human' category?

Thanks in advance.