How does Maintenance work ?

[Kel]

Been playing some and reading this forum a lot and have developed a few questions here and there. First subject I am unclear on is maintenance...

Did a quick search for maintenance in titles but didn't see anything.

2 questions, essentially:

1) What units actually cost maintenance, outside of the ones you recruit ? For example, wolfherder wolves ? Free militia/flagellants from events ? Summoned beasties ?

2) I seem to recall the normal maint. cost is based off of the recruitment gold cost. Anyone happen to know the specific formula ? And if the non-recruited creatures have a maint. cost, is there a reliable way to estimate that, without the recruitment cost ?

Thanks, in advance, for any consideration of my post

- Kel