[PvK]

_Preaching_ can exceed your base dominion strength in a specific province, but temple spread won't. So someone with Holy-3, for example, can preach a province up to 6 candles, or 7 with a temple there, no matter what your base dominion strength is.

Also, dominion spread (from temples, pretender, prophet, home province) that can't raise the dominion in a province, will flow out to a province that it can raise. That's how non-stealthy priests can indirectly help to push dominion out to foreign lands (they max out the home dominion, allowing the temples etc. to spread it to foreign provinces).