The Czar and the Church are Byzantine. The Czar was the true head of the church and defender. The Byzantine Emperor was Christs Vicar on earth. The Patriarch serves at the pleasure of the Czar. But of course intrigues between the Czar and the Patriarch were common.
The architecture of the churches, the dome, was meant to centralize power. The dome represented a portal to heaven and a portal to God, accessed through the church, and vicariously through the Czar, and the Patriarch and the priesthood. Very hierarchical. Even a mans relationship to God was only through the feudal system. Much the same way as the Catholic Church doles out God’s patronage. (zips up flame suit, puts on hood, pulls draw string tight over face, assumes the fetal position).