The Hundred Years' War (1337–1453) is often remembered as a prolonged military struggle between the dynasties of England and France, punctuated by famous battles, shifting alliances, and the emergence of national heroes like Joan of Arc. Yet beyond the siege lines and treaty negotiations, French society was undergoing a profound religious transformation. The fourteenth and early fifteenth centuries witnessed not only political chaos but also a deep spiritual crisis that gave rise to a constellation of religious movements, reform impulses, and heretical challenges. These currents reshaped the collective identity of the French people, altered the relationship between the crown and the Church, and laid intellectual groundwork for the reforms that would sweep across Europe in the following century. Understanding the role of religious movements during this turbulent era reveals how faith, fear, and the search for meaning intersected with the raw demands of war and survival, ultimately forging a more self-aware and spiritually diverse French society.

The Context of the Hundred Years' War

The conflict stemmed from a complex web of feudal loyalties and dynastic claims. When the last Capetian king, Charles IV, died without a male heir in 1328, the French crown passed to Philip of Valois, a cousin. However, King Edward III of England, through his mother Isabella (Charles IV's sister), asserted a supposedly stronger claim to the French throne. Alongside this dynastic dispute, tensions over the duchy of Aquitaine, which English kings held as vassals of the French crown, and economic rivalries in Flanders fueled the outbreak of hostilities. The war would rage intermittently for more than a century, devastating the French countryside with scorched-earth campaigns, mercenary bands, and recurrent famines aggravated by the onset of the Black Death in 1348.

For the common French population, the war meant not only physical insecurity but also a crippling fiscal burden. Repeated taxation to finance military efforts, debasement of coinage, and the collapse of trade networks eroded social stability. Peasants and townsfolk alike saw their traditional structures of authority—manorial lords, local clergy, and even the monarchy—fail to protect them. This pervasive sense of disorder and divine punishment prompted a wave of spiritual questioning. People began to ask whether God had abandoned France, and what collective or individual sins might have provoked such calamities. It was within this crucible of suffering that religious fervor, mystical experience, and radical dissent flourished.

The Religious Landscape of 14th-Century France

At the outset of the war, the institutional Church was both a powerful landholder and a spiritual anchor. France prided itself on being the "eldest daughter of the Church," and its monarchy had long cultivated a close relationship with the papacy. This intimacy became literal in 1309 when Pope Clement V, a Frenchman, moved the papal court to Avignon, a papal territory within the borders of the French kingdom. The Avignon Papacy, which lasted until 1377, centralized ecclesiastical administration but also made the papacy appear subservient to French royal interests in the eyes of many Europeans. For French subjects, however, proximity to the pope reinforced a sense of national religious privilege, even as it drew the Church more tightly into the web of politics and finance.

The situation deteriorated dramatically with the onset of the Western Schism in 1378, when rival claimants to the papacy—one in Rome and one in Avignon—split Western Christendom. France aligned itself with the Avignon line, but the spectacle of two, and later three, competing pontiffs disoriented the faithful. The Schism turned the Eucharist, the central sacrament of unity, into a source of doubt: could a priest ordained by a disputed bishop validly consecrate the host? The crisis undermined the aura of papal authority and opened the door to calls for reform from both clerical and lay quarters. Universities, and especially the University of Paris, became hotbeds of conciliarism—the theory that a general council of the Church held authority superior to the pope. This idea, while aimed at resolving the Schism, would over time erode the hierarchical structure that had dominated medieval Christianity and foster a more nationalized, self-governing approach to French religious life.

Penitential Movements and the Flagellants

One of the most dramatic religious responses to the overlapping disasters of war and plague was the rise of the Flagellant movement. Originating in Italy and spreading quickly to Germany, the Low Countries, and France, groups of laypeople marched from town to town, chanting hymns and whipping themselves until their backs dripped blood. They believed that by imitating Christ’s passion through voluntary suffering, they could appease divine wrath and obtain relief from the pestilence and the endless violence of the war.

The Flagellants appealed to a society steeped in the theology of penance and the fear of purgatory. Their processions were highly theatrical, often culminating in a collective confession of sins and prayers for peace. French chroniclers recorded instances of Flagellant processions in regions like Champagne and Burgundy during the mid-fourteenth century. While some local clergy initially tolerated or even endorsed these displays as genuine acts of piety, the institutional Church soon grew wary. The Flagellants' rejection of ordinary sacramental mediation—they often questioned the need for priestly absolution, claiming their blood washed away sin directly—and their apocalyptic rhetoric threatened ecclesiastical order. In 1349, Pope Clement VI issued a bull condemning the movement, and secular authorities in France increasingly suppressed it as a source of social unrest. Nevertheless, the phenomenon left a lasting imprint: it demonstrated that laypeople could organize mass religious expressions autonomously, and it foreshadowed the later appetite for direct, emotionally charged forms of devotion that would characterize the late medieval period.

The penitential impulse also found milder, more institutionalized outlets. Confraternities—lay associations dedicated to a patron saint, charitable works, and regular prayer—multiplied in French towns and villages. These groups provided mutual aid during famines and war, organized funeral rites for members, and sponsored altarpieces that carried prayers for the dead. Through confraternities, ordinary men and women took greater ownership of their spiritual lives, blending civic identity with religious commitment in ways that indirectly strengthened local solidarity against the depredations of marauding soldiers.

Mysticism and the Quest for Inner Reform

Alongside the public drama of penitential processions, a quieter but equally influential current of mysticism coursed through French religious life. The chaos of the outer world pushed many to seek an interior refuge, a direct encounter with God that could transcend the uncertainties of ecclesiastical politics. The fourteenth century produced an extensive body of vernacular mystical literature that circulated among both religious communities and literate laity.

Figures like the Flemish mystic John of Ruusbroec influenced devout circles in northern France, while the writings of earlier mystics such as Mechthild of Magdeburg were translated and read in courtly and monastic environments. Within France itself, theologians such as Jean Gerson, chancellor of the University of Paris, engaged seriously with mystical theology. Gerson sought to distinguish authentic spiritual experiences from dangerous illusions, writing treatises like The Mountain of Contemplation to guide the devout while warning against heretical excess. His work illustrates how the institutional Church attempted to harness, rather than simply suppress, the yearning for personal holiness that the age’s anxieties had intensified.

Women played a prominent role in this mystical renewal. The Beguines, though more common in the Low Countries, also lived in communities in northern French cities such as Paris and Tournai. These laywomen led lives of prayer and service without taking permanent vows, cultivating a spirituality centered on the humanity of Christ and the Eucharist. Although suspicion sometimes fell upon them—often fanned by clerical fears of unsupervised female religiosity—the Beguine model influenced a broader culture of affective piety. This style of devotion, focusing on emotional identification with the suffering Jesus and the sorrowing Virgin Mary, permeated French religious art, literature, and sermons. Altarpieces of the period increasingly depicted the Pietà, and passion plays invited entire communities to meditate on Christ’s sacrifice. Such shared devotional practices helped bind French society together even as the war threatened to tear it apart, creating a common spiritual vocabulary that crossed class boundaries.

The Challenge of Heretical Movements

The strains of prolonged warfare and the perceived failures of the established Church opened space for more radical dissent. While France never witnessed a mass heretical uprising on the scale of the English Lollards or the Bohemian Hussites, it was not immune to heterodox ideas. The Waldensians, a reformist movement that originated in the twelfth century, still survived in remote Alpine valleys and occasionally found adherents in southeastern France. They preached a simple gospel message, rejected the authority of corrupt priests, and criticized the accumulation of wealth by the Church. Sporadic inquisitorial campaigns attempted to root them out, but the war often distracted ecclesiastical and secular authorities, allowing pockets of dissent to persist.

More unsettling for the hierarchy were the remnants of the Free Spirit heresy, which taught that a soul united with God could transcend moral law. While its actual organized presence was limited, the idea alarmed guardians of orthodoxy because it seemed to empower individuals to claim direct revelation and bypass clerical supervision entirely. In the aftermath of the Black Death and during the confused years of the Schism, ecclesiastical courts in cities like Paris and Narbonne prosecuted a number of individuals accused of antinomian teachings.

The Spiritual Franciscans also represented a challenge within the Church itself. This faction of the Franciscan order advocated absolute poverty in strict imitation of Christ, criticizing the worldliness of the papacy and the wider clergy. Though their influence was more pronounced in Italy and southern France, the controversy echoed in French theological circles. The condemnation of the Spirituals by Pope John XXII in the early fourteenth century, and the intense debate over the poverty of Christ, sharpened critical attitudes toward the institutional Church’s wealth. These debates would later nourish the arguments of conciliarists and Gallican reformers who sought to limit papal fiscal demands on French dioceses.

The Avignon Papacy, Gallicanism, and National Identity

The relocation of the papacy to Avignon had far-reaching consequences for the relationship between the French crown and the Church. On one level, it seemed a triumph of French influence: a succession of popes, most of them French, governed Christendom from a city surrounded by French territory. The Avignon popes built a magnificent palace and an efficient administrative machinery that channelled immense revenues into their coffers. However, this very efficiency generated resentment. The papacy’s centralizing tendencies—appointing bishops directly, claiming the revenues of vacant benefices, and selling indulgences on an unprecedented scale—caused many in France to feel that their local churches were being exploited to fund a distant, lavish court.

These grievances crystallized in the growing movement of Gallicanism, which asserted the traditional liberties of the French Church against papal absolutism. During the Hundred Years' War, French kings and their advisors increasingly invoked Gallican arguments to justify taxing the clergy without papal consent and to limit appeals to Avignon. The University of Paris produced a stream of treatises defending the autonomy of the French church and the jurisdictional rights of bishops. The Pragmatic Sanction of Bourges, issued by King Charles VII in 1438—even as the war was winding down—was the crowning legislative expression of this mood. It recognized the superiority of ecumenical councils over the pope, restricted papal provisions to benefices, and affirmed the right of French cathedral chapters to elect their bishops. Although negotiated in the context of the Council of Basel, the Pragmatic Sanction built on decades of resentment and reflection that the war and the Schism had fostered. It tied the French Church more closely to the monarchy and laid the foundation for a national religious identity that would endure until the Concordat of Bologna in 1516.

The religious ferment of the era was not confined to theologians and princes. It erupted into the public square through a proliferation of popular preaching. Mendicant friars—Franciscans and Dominicans—traveled through war-torn regions calling for repentance and conversion. Some gained enormous followings and became informal mediators in local conflicts. However, the line between orthodox fervor and political agitation could blur quickly. The Jacquerie peasant uprising of 1358, though primarily a response to economic exploitation and military incompetence, drew on religious imagery of divine vengeance and the overturning of unjust hierarchies. Rebel leaders sometimes invoked apocalyptic prophecies, foretelling the punishment of the nobility and the Church as instruments of God’s justice.

A half century later, the career of Joan of Arc would demonstrate how seamlessly popular religion, mystical visions, and national politics could merge. Joan’s voices and visions propelled her from the village of Domrémy to the court of the dauphin Charles, where she convinced skeptics to let her lead an army to the relief of Orléans. Her mission was explicitly religious: she believed God had chosen her to crown Charles king and expel the English. Joan’s remarkable success, followed by her capture, trial for heresy, and execution in 1431, reveals the deep ambiguities of the era’s religious movements. The same ecclesiastical authorities who had condemned individual mystics and heretics were now confronted with a devout young woman whose claims of divine inspiration could not easily be dismissed. Joan’s eventual rehabilitation in 1456 and later canonization signaled the Church’s recognition that the popular piety of the war years, however unsettling to institutional norms, had genuinely shaped the nation’s destiny.

The Impact of Religious Movements on French Society

Taken together, the religious movements of the Hundred Years' War left several enduring legacies. First, they weakened the monopoly of the institutional clergy over spiritual life. Laypeople, whether through confraternities, mystical reading, or participation in penitential processions, assumed a more active role in defining and practicing their faith. This democratization of devotion, while still operating largely within orthodox boundaries, anticipated the lay-led reform movements of the sixteenth century.

Second, the Great Schism and the conciliar debates that it provoked fundamentally altered the constitutional imagination of the Church in France. The notion that a council, representing the collective body of the faithful, could judge and even depose popes established a precedent for limiting absolute power. Applied to the secular realm, this principle resonated with emerging theories of representative government. The Estates-General, though irregularly convened, drew strength from the same conceptual soil: the idea that the community as a whole had rights that even the king must respect.

Third, the fusion of religious and national sentiment—already visible in the cult of Saint Denis, the patron of France—intensified during the war. The English were increasingly depicted not merely as military enemies but as agents of a schismatic or even heretical cause. The Avignon papacy’s French character reinforced the belief that France was specially favored by heaven, a conviction that Joan of Arc would later embody with electrifying clarity. This nascent religious nationalism helped sustain morale through decades of defeats and provided a rallying point that transcended regional and class divisions.

Finally, the spiritual yearning and critical questioning that emerged in these years did not disappear with the war’s end. They flowed into the broader currents of late medieval reform. The Pragmatic Sanction of Bourges institutionalized many of the conciliarist and Gallican principles that had been sharpened by conflict. French humanists and reformers of the late fifteenth century, while often critical of popular superstition, built on the foundation of vernacular piety and lay engagement that the earlier movements had laid. When the Protestant Reformation erupted, France would prove both fertile ground for new ideas and a bastion of a distinctive Catholic reform, a dual heritage that the Hundred Years' War had helped to forge.

Conclusion

The Hundred Years' War was far more than a clash of armies; it was a crucible in which the religious soul of France was tested and transformed. In the shadow of plagues, famines, and chronic violence, the French people sought meaning and divine favor through penitential processions, mystical interiority, and public preaching. They witnessed the spectacle of a divided papacy and learned to imagine a Church governed by councils rather than by an all-powerful pope. They saw prophets and visionaries rise from their own ranks, and they participated in a gradual, often painful, renegotiation of the boundaries between lay and clerical, local and universal, national and Roman. The religious movements that flourished amid the chaos did not merely reflect the anxieties of an era; they actively shaped the institutions, loyalties, and spiritual habits that would define France long after the last English garrison had been expelled from its soil. Their legacy persisted in the Gallican Church, in the devotions of confraternities, and in the enduring conviction that the nation’s fate was bound up with its fidelity to a divine calling—a conviction that would echo across French history for centuries to come.