Augustine used Neoplatonism; Thomas Aquinas used Aristotelianism.

The above explains much as to why sexism exists in our church today & how the real start of rejecting women from priestly & same ordination as men, actually came from the time of these men & not from earlier times but was a change from having male and female presbyters/priests and a leaving of following what the Gospels actually taught which is all believers should be treated the same..  

These saints, though I love them, and they are wise in many ways, were inflicted with the weakness of misogyny and the belief that women are lesser people and deserving of lesser treatment in our church.  They had no evidence in the Gospels to back their discrimination against women in church holy orders and leadership, so because they wanted an all male hierarchy & valued various philosophers of Roman and Greek History, they chose to put some of these pagan ideals above the ideals and commands of the Gospels & wrongly rejected women.