Joseph Canning 
A History of Medieval Political Thought [PDF ebook] 
300 1450

First Published in 2005. The book covers four periods, each with a different focus. From 300 to 750 Canning examines Christian ideas of rulership. The often neglected centuries from 750 to 1050, the Carolingian period and its aftermath, are given special attention. From 1050 to 1290 the conflict between temporal and spiritual power and the revived legacy of antiquity comes to the fore. Finally in the period from 1290 to 1450, Canning focuses on the confrontation with political reality in ideas of church and state, and in juristic thought.