Some recommendations from "JA":

Sovereignty: God, State, and Self by Jean Bethke Elshtain

This may be the most relevant to your interests. Elshtain, a political theorist, considers modern understandings of sovereignty in regard to the state and individual as derivative of certain late scholastic that abandoned Neoplatonic and Aristotelian metaphysics for nominalism/voluntarism.


The Theological Origins of Modernity by Michael Allen Gillespie

Gillespie, a political theorist and philosopher, covers the same general trends as Elshtain, but his focus is not on sovereignty in particular, but broader.

Some rights theorists make a big deal about medieval theological discussions of sovereignty, but does the modern concept of sovereignty really have roots in nominalism/voluntarism?