Who do you usually promote to prophet?

[Adept]

Originally I went for boosted combat types. Tough knights and the like, but as was already pointed out, campainging outside your own dominion really takes a lot out of the prophet.

These days, I always go for a priestly type. Even promotin a lvl 3 priest to lvl 4 is worth it in my books, especially if there's trouble with the undead.