A most excellent ending to this game!
The reasons we won this, in my opinion:
1. No weed. We had a good, solid team, who didn't push their luck but rather worked steadily towards the greater goal, didn't take unnecessary risks to steal all the glory, and generally worked together very well.
2. The Oracle slingshot worked. We had been successful at early stages, keeping pressure form the AI that didn't give them much time to build this crucial wonder, held out long enough to grab Code Of Laws, and only then build this wonder. With early Bureaucracy, our capital turned into a production powerhouse.
3. Good location. While being in the middle of Pangea in a normal game is not such a great prospect, here this meant that there weren't any faraway civs that could have run away with technology while we were plowing through the immediate neighbours.
4. No barbarians. This meant that our wounded units were safe in the outlands, and our forces could travel all the way to the enemy without undue hassle.
5. Lady luck was on our side. Had we lost an important battle or two, the outcome would have been very different.
Good game, team!