Well, I almost won. Got 5 Social Policy trees completed, but didn't have enough time to build it before I lost my capital. I do have to say it's really fun to defend against a much larger military and more advanced military with only knights and crossbowmen. But, I suppose I'll come back to a culture victory later. Took me a bunch of trial and error to win my first domination victory, so I imagine I'll fail a few times here as well.