As a Byzantinist, I'm interested in the development of Orthodox dogma from the foundation of Constantinople to its fall in 1453, as it was a primary feature of the society. Russian orthodoxy sprang out of the Byzantine (the Kiev mission etc.), and I find the whole period far more interesting that the development of the Church in the west.
Gregory of Nazianzus on Constantnople:
Everywhere, in the public squares, at crossroads, on the streets and lanes, people would stop you and discourse at random about the Trinity. If you asked something of a moneychanger, he would begin discussing the question of the Begotten and the Unbegotten. If you questioned a baker about the price of bread, he would answer that the Father is greater and the Son is subordinate to Him. If you went to take a bath, the Anomoean bath attendant would tell you that in his opinion the Son simply comes from nothing.
Anyway, we haven't even been given a topic for discussion at this point.