From the post: http://ericrobertmorse.com/spiritual-types/
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St. Gelasius Letter to Emperor Anastasius
Letter of Pope Gelasius to Emperor Anastasius on the superiority of the spiritual over temporal power: The pope's view of the natural superiority of the spiriitual over the temporal power finds a clear expression the following remarkable letter of Gelasius I (494). There are two powers, august Emperor, by which…
In "Culture"

Augustine’s Two Cities
In the wake of the Vandals' sack of Rome, St. Augustine authored City of God, a seminal work delineating his two-cities doctrine. This doctrine separates the earthly city from the City of God, reflecting a profound understanding of the interplay between church and state. Augustine acknowledged the divinely appointed role…
In "Charity"