Medieval (European Christian 5-15th century) theologians used to argue between a few ideas about the origin of the soul (creationism, traducianism & pre-existence). However, was any belief about the origin of the soul widespread enough in this spacetime, that it would also affect the common people's lives?
For instance, I imagine the belief in the pre-existence of the soul could imply that the wealth that one is born into could already be a punishment or a reward for one's life before birth.