Medieval political thought was shaped less by empirical observation and more by theological doctrine and inherited tradition. From the fall of the Roman Empire to the rise of modern nation-states, political ideas were dominated by Christianity, feudal relationships, and lingering Roman influences. Thinkers such as St. Augustine, Gregory the Great, St. Thomas Aquinas, and Pope Gelasius I helped shape a worldview in which political authority derived from divine will.
At the heart of medieval political theory stood the struggle between ecclesiastical and secular power, expressed in the famous “Doctrine of the Two Swords.” Medieval thinkers envisioned a unified Christian society—one empire, one church—yet practical conflicts between pope and emperor revealed the tension between theory and reality. The nature of medieval political thought reflects this profound interplay between theology, law, and governance.
“The Christian emperor needs the ecclesiastic for the attainment of eternal life, and the ecclesiastic depends upon the government of the emperor in temporal things.”
— Pope Gelasius I
The Nature of Medieval Political Thought.
During the greater part of the medieval period, political life was influenced but little by conscious purpose or by deliberately formulated theory. Certain ideas, surviving from the Roman tradition, resulting from the teachings of Christianity, or growing out of the relations of feudalism were generally held, but they exerted little practical influence upon political institutions.
From the decline of the Greek city-state to the rise of modern national states, except for the influence of Roman jurisprudence, philosophy was essentially non-political. Ideals of cosmopolitanism or a life of religious mysticism sufficed for the individual, apart from a determinate human society.
The individualized state, with its strenuous life of war and politics, disappeared. The ideal of world unity and a single imperial authority was far removed from the facts of decentralization and anarchy in the Western world. This discrepancy between theory and institutions in the Middle Ages is to be explained by the general nature and method of medieval thought.
Thought in the Middle Ages was unhistorical, unscientific, and uncritical. It reasoned by deduction from general dogmas based upon belief, rather than by induction from observation, investigation, and experiment. Learning was controlled by the clergy, especially by the monastic element, and speculation centered on questions of theology.
The whole body of faith, developed and handed down by the organized church, was the basis of all knowledge; and this material was turned over and over by the narrow intellectual processes of scholasticism or accepted without rational demonstration by the contemplative introspection of mysticism. The thought was enchained by a rigid orthodoxy, and dissenting ideas were considered heresies to be ruthlessly hunted down.
The relation of ecclesiastical to secular power was an issue in medieval political thought. At different periods the controversy centered around concrete, and sometimes local, phases of the question; but the general tendency from the ninth to the thirteenth century was toward the development of a well-rounded theory of ecclesiastical and papal supremacy in world politics. In building up this doctrine, most of the ancient Greek and Roman writers were discarded as profane and, except for a slight uncritical appeal to history, the source of all knowledge was found by the monkish writers in the Bible and the works of the Church Fathers, especially St. Augustine and Gregory the Great.
As the conflict between church and state grew more intense, increasing use was made of the Old Testament, whose aggressive, theocratic point of view was more useful for church purposes than the submissive tone and indifferent political attitude of the New Testament. It was assumed that the history of Israel foreshadowed the life of the church, and the medieval theory of politics was decisively influenced by the Old Testament picture of the Israelite state.
The idea that law was the direct will of God, the important governmental authority of the priesthood, and the theocratic traditions that limited the powers of the king were all used by church writers to support their claims. And since the Old Testament ascribed the greatest success to those kings who were most subservient to the prophets, the church writers argued that the subordination of secular to spiritual authority represented the divine plan of government.
Medieval political theory was based upon certain ideas on which all parties were agreed. The ghost of ancient Rome haunted men’s minds, and the ideal of unity was firmly established. It was generally believed that there should be in Europe one state and one church, that authority in each should be concentrated in a single head, that church and state should be fused into a single system, and that the ultimate source of all authority was divine.
Men lived in a universal society, which was at once a continuation of the Roman Empire and an incarnation of Christ in a visible church. The universal political empire of Rome had been established under God’s will so that within it might be formed the universal church.
Although church and state formed one society, nevertheless that society had two governments. The existence of two systems, and the strong contrast drawn by Christian writers between things of the world and things of the spirit, led to the famous doctrine of the two swords, providing for a twofold, harmonious division of authority between the pope and the emperor. This principle was stated at the close of the fifth century in a letter written by Pope Gelasius I to the emperor.
The true and perfect king and priest were Christ himself… But Christ, knowing the weakness of human nature, and careful for the welfare of His people, separated the two offices, giving to each its peculiar functions and duties. Thus the Christian emperor needs the ecclesiastic for the attainment of eternal life, and the ecclesiastic depends upon the government of the emperor in temporal things.
This text was quoted frequently by the Church Fathers and was supported by the symbolism of the two swords one of the spirit, the other of the flesh from which the doctrine drew its name.
At first, this perfect harmony between secular and spiritual authority in a unified church-state was conceived to be the divinely ordained system for ruling the earth. Each power was to rule in its sphere, and neither was to interfere in the affairs of the other. But unhappily, this theory of dual authority was unworkable in practice.
It proved impossible to separate secular from spiritual matters under the conditions of medieval life. Each authority charged that the other encroached upon its domain, and each tried to build up a system of doctrine that would justify the extension of its powers. Each could appeal to historical facts and biblical passages to support the widest claims and to justify the submission of its rival.
FAQ
1. What is medieval political thought?
Medieval political thought refers to political ideas developed in Europe between the 5th and 15th centuries, heavily influenced by Christianity, Roman law, and feudalism.
2. What was the Doctrine of the Two Swords?
The Doctrine of the Two Swords, articulated by Pope Gelasius I, argued that authority was divided between spiritual power (the pope) and temporal power (the emperor), both ordained by God.
3. Why was the Church dominant in medieval politics?
Learning and intellectual life were controlled largely by clergy. Political authority was believed to originate from divine will, and church leaders interpreted scripture as the foundation of governance.
4. How did the Old Testament influence medieval political theory?
Medieval writers used the Old Testament’s theocratic model of Israel to justify priestly authority and limit secular rulers, reinforcing arguments for ecclesiastical supremacy.
5. Who were key thinkers in medieval political philosophy?
Important figures include St. Augustine, St. Thomas Aquinas, Dante Alighieri, and Marsilius of Padua.