“I know there is some sort of split, but I think the Roman Church/various Eastern Churches (not just Orthodox) split on Marian issue are the Assumption and the Immaculate Conception.”
The only dispute any Eastern Christian Church, Orthodox or otherwise, has with official Roman Mariology is the dogna of the Immaculate Conception and, as W points out, that has to do with differing conceptions of the Sin of Adam, not Panagia herself. There is a technical difference about the Assumption. The Eastern Churches have not dogmatized that belief, though I know no Eastern Christian who does not believe that the Most Holy Theotokos was assumed bodily into heaven after her falling asleep in Christ.
Tertullian, btw, died a condemned heretic. he had some extremely bizarre beliefs in his later years.
“(James proto-something)”
The Protoevangelium of James. Here’s a link:
http://www.ccel.org/ccel/schaff/anf08.vii.iv.html