Then you'll need to crank out the crossbows as soon as you can and just research feudalism and theocracy in the meantime. In my latest game I was attacking Wang Kon (who is protective) on Noble level with crossbow-rushing (I skipped bringing catapults) and won over all but 2 of his cities before he teched up to feud himself. I actually used the oracle to give me aesthetics, from then I very quickly got the Great Library in my capital, greatly lessening the time it took for me to snag feud and theo.