[thejeff]

1) Up to 4 sites. This counts sites from events, but not temples, labs or forts, just like you can build a building in a province with 4 sites.
It counts non-hidden sites (level 0). It counts the sites that produce forts, but not the fort itself.
Buildings are not sites.
Luck events create sites, but only if there is room for them.

2) Random dispel. Same mechanics. Can overwrite your own globals. Obviously, if you're casting a global that already exists it will go against that one.

5) Execution order is not rearrangeable. It goes by unit id. Which is also the order commanders are shown in the army set up screen. Order in battle is fixed, top to bottom. Ritual casting order, I believe, flips between top to bottom and bottom to top randomly.

6) Protection is damage reduction. Applied to every attack. Does not get reduced like defence.

7) 5 fatigue for item spells. No encumbrance.