1.22 ok for me too
My initial idea was Sci, agri : sumeria too. free tech, cheap libs will be good to keep up in science and agri is always a great char. However Celts are fine for me too, we should be able to keep up in research at monarch level anyway and militaristic + celt swords is a dangerous combination too.
So Sumeria and Celts both ok (with slight pref for sumeria [
])