Well, it's a tie between two options for me.
On the one hand, 4th Edition D&D has the goddess Erathis, patron of civilization, laws, judges, etc. And civilization is a really awesome idea. Seriously, fuck anarchy.
On the other hand, Princess Celestia and Princess Luna are, well, right there and actually do stuff (moving the sun and moon). Also, they're winged unicorns.
Decisions, decisions.
P.S. I just realized that all the figures that sprung to mind are female. Not sure what that says about me.