[SurvivalistMerc]

Zen,

The population loss tends to vary with the size of the attacking barbarian horde. But I have definitely lost over 1000 at times. That's a permanent loss and it hurts.

Barbarians appear to get a "bonus" to pillaging. Oh joy. And I think you can get the amounts on Sunraybe's site.

Unfortunately, I don't have exact numbers to offer you here. That is because the game doesn't let you go back and see what the population was the previous turn and doesn't tell you how much was killed in the pillage. So I only know when my home province or another major castle province gets hit, if that makes sense.