Dominion spread into enemy territories?

[Foodstamp]

I was curious how dominion spread works exactly. There is a description of how it works in the game manual, but there are a few finer points I am confused about.

1) If you have a pretender starting with 10 dominion, is there any benefit to building temples?

2) What can you do to help push your dominion into provinces you do not control?

3) What are the benefits of blood sacrifices to dominion? Beyond increasing the dominion in the territory of the sacrifice, do blood sacrifices help to increase your overall dominion or help it spread to enemy territories?

thanks!