The Catholic Church and the Medieval Roman-Imperial Idea: Papal Suzerainty over the French Kingdom and the Claims of the Holy Roman Empire

Abstract

This article explores the Catholic vector in realizing the Roman-Imperial idea within the Western European kingdoms during the Middle Ages. The analysis focuses on the establishment of papal suzerainty over the West Frankish Kingdom (later the Kingdom of France), positioning the Holy See’s authority as a key institutional counterbalance to the ambitions of the emperors of the Holy Roman Empire. The legal framework of medieval Western Europe is interpreted through the legacy of late antique patron-client relations, which evolved into a system of public law based on suzerain-vassal dynamics. Particular attention is paid to the genesis of the Ottonian “Western Empire” amid the decline and eventual dissolution of the Carolingian imperial project. The article identifies the root causes of the enduring conflict between the Apostolic See and the imperial throne. It underscores the coexistence of two traditional imperial jurisdictions within Christendom – Western Roman (manifested in the Holy Roman Empire) and Eastern Roman (embodied by Byzantium) – and highlights the Papacy’s struggle to assert its own imperial identity. France emerges as the primary arena for this ideological confrontation, where Papal Rome contested the Holy Roman emperors over competing visions of imperial transformation. The Concordat of 1104, concluded by Philip I of France, is presented as a prelude to the Worms Concordat of 1122 between Church and Empire. The strong initial position of the Roman See in France enabled the Capetian monarchy to preserve its political autonomy in the face of imperial encroachments upon Burgundy and Western Francia. In contrast, the investiture controversy in the German principalities of the Holy Roman Empire escalated into a full-scale civil conflict. The Concordat of Worms significantly enhanced the secular authority of the Catholic Church, elevating it to a dominant political force capable of subjugating both kings and emperors. Ultimately, in 1301, Pope Boniface VIII issued the bull Unam Sanctam, deposing Philip IV of France – a move later annulled by his successor. Nevertheless, the very assertion of papal power to enthrone or dethrone monarchs affirms France’s integration into a broader imperial legal order that fused spiritual and temporal jurisdictions.