For more than a century, the Byzantine Empire was convulsed by a bitter struggle over religious images that sparked riots, persecutions, and political upheaval. As Zoe Tsiami explains, Byzantine iconoclasm was far more than a debate about art, becoming a battle over theology, imperial authority, and the very identity of the medieval Roman world.
By Zoe Tsiami
Through a conflict that erupted in the eighth and ninth centuries, the Byzantine Empire experienced a profound transformation. The very foundations of theological thought were shaken. This period was not only about the legitimacy of religious images but also about the authority of emperors, the vital role of monks, and the identity of the Christian Roman state. At the heart of it all was religious iconoclasm. The tumult surrounding icons—known as Byzantine Iconoclasm—ignited riots, persecutions, coups, and lasting divisions, driving society to confront deep-seated beliefs. For over a century, the empire oscillated between reverence and destruction of sacred images, highlighting the intricate interplay of theology, politics, popular worship, and the essence of the empire’s survival.
What Were Icons, and Why Did They Matter?
A 10th-century Byzantine Icon with the Crucifixion – photo courtesy The Metropolitan Museum of Art
Icons in Byzantium transcended mere artistic expression; they were revered as sacred portals to the divine. To the faithful, these vivid images served as tangible connections to holy figures—Christ, the Virgin Mary, and the saints—inviting believers into an intimate encounter with the divine realm. They were not just static representations; icons were passionately kissed, paraded through bustling streets, carried into the chaos of battle, and were believed to possess miraculous powers. For countless Byzantines, icons were woven into the very fabric of Christian life, representing a profound devotion that permeated their existence.
This fervent reverence for icons is what rendered them so perilous in the eyes of reformists: attacking an icon was not merely a challenge to religious orthodoxy but an assault on the emotional and spiritual core of society itself. For iconophiles—those steadfast believers who upheld the significance of these sacred images—the destruction of an icon felt like a profound denial of the Incarnation, the cornerstone belief that God embraced humanity through the flesh of Jesus Christ. Thus, icons stood as both spiritual touchstones and battlegrounds for faith in an era rife with theological conflict.
The Theological Fault Line: Incarnation vs. Idolatry
Argument about icons before the emperor, in the Skylitzis Chronicle
At the heart of the controversy lay a profound theological quandary, one that stirred passionate debates among early Christians. Iconoclasts voiced strong criticism of the visual representations of Christ, deeming it an essential problem. They grappled with the paradox of Christ’s dual nature: if he was both fully human and fully divine, how could any crafted image truly reflect his divinity without diminishing his essence to mundane matter? These critics contended that efforts to visually depict Christ risked confounding his two natures or, worse still, tearing them apart—positions that had been vehemently condemned in previous Christological disputes.
Relying heavily on scriptural foundations, including a stringent prohibition from the Old Testament against graven images, iconoclasts expressed concern that the fervent devotion surrounding icons had devolved into outright idolatry. They feared that many Christians were unwittingly attributing divine qualities to mere wood and pigment, diverting reverence from God himself to lifeless materials.
In stark contrast, iconophiles advocated for a richer understanding of the Incarnation. They argued that when God chose to become incarnate in Christ, he sanctified matter itself, making it redeemable. Icons, they posited, could not encapsulate Christ’s divinity but could embody his human form, as articulated in the Gospels. To deny the use of icons, they asserted, was to reject the reality of God’s profound act of becoming human. This debate transcended mere academic discourse; it resonated deeply with a populace steeped in centuries of doctrinal divergence, tapping into the core of Christian belief and identity.
Power in Imperial Domination and the Beginnings of Iconoclasm
A 19th-century depiction of Leo III ordering the destruction of icons – Geschichte der Päpste, Volume 1 by Patuzzi, Alexander. Published by Albert A. Wenedikt, Vienna, 1868.
The first phase of iconoclasm began under Emperor Leo III in the 720s. This timing was not coincidental, as Byzantium was facing several struggles, including military defeats against Islamic forces, territorial losses, and natural disasters like earthquakes and volcanic eruptions. Many contemporaries interpreted these events as signs of God’s displeasure. Additionally, the strong presence of Islam, which prohibited religious imagery, influenced Byzantine thought. Some Byzantine philosophers began to suspect that Christian iconography might have offended God, weakening the empire’s strength.
This perception likely explains Leo III’s policies, though historians debate the extent of Islamic influence on his decisions. What is clear is that Leo III asserted imperial authority over religious practices. By dismissing prominent icons, particularly the famous icon of Christ above the Chalke Gate of the imperial palace, he emphasized that theology was not solely the domain of bishops and monks. This assertion of imperial control over doctrine became a defining characteristic of the iconoclastic movement.
Riots, Resistance, and Popular Fury
14th-century miniature of the destruction of a church under the orders of the iconoclast emperor Constantine V (741-775)
The removal of icons sparked significant unrest. Crowds rioted in defense of sacred images in Constantinople and other cities. When imperial agents attempted to destroy the icon at the Chalke Gate, they were ambushed by civilians, resulting in several deaths. These incidents were not isolated but rather indicative of widespread popular opposition.
Monks emerged as the most vocal and persistent opponents of iconoclasm. Monastic communities served as centers for icon production and theological education, enjoying considerable prestige in society. Iconoclast emperors viewed monks as politically subversive and economically unproductive, leading to persecution. Monks were exiled, imprisoned, or forced to marry, while monasteries were closed or confiscated. Icons were destroyed, whitewashed, or replaced with symbolic imagery, such as crosses. However, these measures often backfired, turning monks into martyrs and reinforcing the public’s attachment to icons. The most aggressive phase of iconoclasm occurred under Constantine V, the son of Leo III.
Unlike his father, Constantine was a committed theologian who made a systematic case against the veneration of icons. In 754, he convened a council at Hieria that condemned icon veneration as heretical. Constantine’s reign demonstrated how iconoclasm intersected with broader social tensions. His policies specifically targeted the wealth and influence of monasteries, redirecting monastic resources toward the army and the state. Thus, iconoclasm became a tool for centralization and reform, rather than merely a means of religious purification. At the same time, Constantine cultivated the image of a victorious and divinely favored ruler. His military successes against Arab forces reinforced the belief that iconoclasm had restored God’s favor. For supporters of the policy, theology and geopolitics seemed to align.
Following the death of Constantine V, the first iconoclastic period ended abruptly. In 787, Empress Irene, serving as regent for her son, convened the Second Council of Nicaea, which restored the veneration of icons. The council carefully distinguished between worship (latreia), which is owed to God alone, and veneration (proskynesis), which could be given to icons. This theological compromise allowed icons to return without endorsing idolatry. However, the restoration was fragile. Irene’s political position was precarious, and iconoclasm continued to receive support from certain segments of the military and bureaucracy.
Late 14th-early 15th century icon illustrating the “Triumph of Orthodoxy” under the Byzantine empress Theodora over iconoclasm in 843. (National Icon Collection 18, British Museum).
Iconoclasm was revived in 815 under Leo V, inaugurating a second phase that lasted until 843. This period was less violent than the first but reaffirmed how unresolved the controversy remained. Emperors continued to view iconoclasm as a means of asserting authority and restoring divine favor, while iconophiles framed their resistance as a defense of orthodoxy itself. The final restoration of icons came under Empress Theodora, who ended the iconoclastic movement in 843. This event was commemorated as the “Triumph of Orthodoxy” and continues to be celebrated in today’s Eastern Orthodox Church.
Iconoclasm was particularly destabilizing because it affected every level of Byzantine life. It was not only a theological issue; it was also political. It influenced imperial policy as well as popular religion, pitting emperors against monks, urban crowds against soldiers, and rival visions of Christian identity against one another. Unlike many doctrinal disputes, iconoclasm was visible and tangible. An icon could be smashed in public; a wall could be whitewashed overnight. In a society where sacred images were woven into daily experiences, these acts were impossible to ignore and emotionally charged. Ultimately, iconoclasm exposed a fundamental tension in Byzantium—who had the authority to define orthodoxy? Was the emperor God’s chosen guardian of the Church, or merely its protector? At its core, the century-long struggle over icons was a power struggle.
Byzantine iconoclasm was not a peripheral controversy or a moment of religious eccentricity. It was a crisis that revealed the deep interdependence of theology, politics, and society in the medieval Roman world. That the empire survived this crisis at all is remarkable. The fact that it emerged with icons firmly embedded in Orthodox Christianity shaped Eastern Christian identity for centuries. In their attempts to purify the faith and strengthen the state, the iconoclast emperors unleashed forces they could not fully control. The riots, persecutions, and theological battles of the iconoclastic age remind us that in Byzantium, ideas were never merely abstract; they were matters of empire.
Zoe Tsiami is a PhD(c) in Byzantine History at University of Thessaly. Her research interests include baptism, catechism and naming practices in the Early Byzantine period. She has published papers and taught at workshops relevant to Early Byzantine/Christian history.
Top Image: A scene from the Chuldov Psalter, which dates to the mid-ninth century, showing John VII, the iconoclast Patriarch of Constantinople, rubbing out a painting of Christ with a similar sponge attached to a pole.
For more than a century, the Byzantine Empire was convulsed by a bitter struggle over religious images that sparked riots, persecutions, and political upheaval. As Zoe Tsiami explains, Byzantine iconoclasm was far more than a debate about art, becoming a battle over theology, imperial authority, and the very identity of the medieval Roman world.
By Zoe Tsiami
Through a conflict that erupted in the eighth and ninth centuries, the Byzantine Empire experienced a profound transformation. The very foundations of theological thought were shaken. This period was not only about the legitimacy of religious images but also about the authority of emperors, the vital role of monks, and the identity of the Christian Roman state. At the heart of it all was religious iconoclasm. The tumult surrounding icons—known as Byzantine Iconoclasm—ignited riots, persecutions, coups, and lasting divisions, driving society to confront deep-seated beliefs. For over a century, the empire oscillated between reverence and destruction of sacred images, highlighting the intricate interplay of theology, politics, popular worship, and the essence of the empire’s survival.
What Were Icons, and Why Did They Matter?
Icons in Byzantium transcended mere artistic expression; they were revered as sacred portals to the divine. To the faithful, these vivid images served as tangible connections to holy figures—Christ, the Virgin Mary, and the saints—inviting believers into an intimate encounter with the divine realm. They were not just static representations; icons were passionately kissed, paraded through bustling streets, carried into the chaos of battle, and were believed to possess miraculous powers. For countless Byzantines, icons were woven into the very fabric of Christian life, representing a profound devotion that permeated their existence.
This fervent reverence for icons is what rendered them so perilous in the eyes of reformists: attacking an icon was not merely a challenge to religious orthodoxy but an assault on the emotional and spiritual core of society itself. For iconophiles—those steadfast believers who upheld the significance of these sacred images—the destruction of an icon felt like a profound denial of the Incarnation, the cornerstone belief that God embraced humanity through the flesh of Jesus Christ. Thus, icons stood as both spiritual touchstones and battlegrounds for faith in an era rife with theological conflict.
The Theological Fault Line: Incarnation vs. Idolatry
At the heart of the controversy lay a profound theological quandary, one that stirred passionate debates among early Christians. Iconoclasts voiced strong criticism of the visual representations of Christ, deeming it an essential problem. They grappled with the paradox of Christ’s dual nature: if he was both fully human and fully divine, how could any crafted image truly reflect his divinity without diminishing his essence to mundane matter? These critics contended that efforts to visually depict Christ risked confounding his two natures or, worse still, tearing them apart—positions that had been vehemently condemned in previous Christological disputes.
Relying heavily on scriptural foundations, including a stringent prohibition from the Old Testament against graven images, iconoclasts expressed concern that the fervent devotion surrounding icons had devolved into outright idolatry. They feared that many Christians were unwittingly attributing divine qualities to mere wood and pigment, diverting reverence from God himself to lifeless materials.
In stark contrast, iconophiles advocated for a richer understanding of the Incarnation. They argued that when God chose to become incarnate in Christ, he sanctified matter itself, making it redeemable. Icons, they posited, could not encapsulate Christ’s divinity but could embody his human form, as articulated in the Gospels. To deny the use of icons, they asserted, was to reject the reality of God’s profound act of becoming human. This debate transcended mere academic discourse; it resonated deeply with a populace steeped in centuries of doctrinal divergence, tapping into the core of Christian belief and identity.
Power in Imperial Domination and the Beginnings of Iconoclasm
The first phase of iconoclasm began under Emperor Leo III in the 720s. This timing was not coincidental, as Byzantium was facing several struggles, including military defeats against Islamic forces, territorial losses, and natural disasters like earthquakes and volcanic eruptions. Many contemporaries interpreted these events as signs of God’s displeasure. Additionally, the strong presence of Islam, which prohibited religious imagery, influenced Byzantine thought. Some Byzantine philosophers began to suspect that Christian iconography might have offended God, weakening the empire’s strength.
This perception likely explains Leo III’s policies, though historians debate the extent of Islamic influence on his decisions. What is clear is that Leo III asserted imperial authority over religious practices. By dismissing prominent icons, particularly the famous icon of Christ above the Chalke Gate of the imperial palace, he emphasized that theology was not solely the domain of bishops and monks. This assertion of imperial control over doctrine became a defining characteristic of the iconoclastic movement.
Riots, Resistance, and Popular Fury
The removal of icons sparked significant unrest. Crowds rioted in defense of sacred images in Constantinople and other cities. When imperial agents attempted to destroy the icon at the Chalke Gate, they were ambushed by civilians, resulting in several deaths. These incidents were not isolated but rather indicative of widespread popular opposition.
Monks emerged as the most vocal and persistent opponents of iconoclasm. Monastic communities served as centers for icon production and theological education, enjoying considerable prestige in society. Iconoclast emperors viewed monks as politically subversive and economically unproductive, leading to persecution. Monks were exiled, imprisoned, or forced to marry, while monasteries were closed or confiscated. Icons were destroyed, whitewashed, or replaced with symbolic imagery, such as crosses. However, these measures often backfired, turning monks into martyrs and reinforcing the public’s attachment to icons. The most aggressive phase of iconoclasm occurred under Constantine V, the son of Leo III.
Unlike his father, Constantine was a committed theologian who made a systematic case against the veneration of icons. In 754, he convened a council at Hieria that condemned icon veneration as heretical. Constantine’s reign demonstrated how iconoclasm intersected with broader social tensions. His policies specifically targeted the wealth and influence of monasteries, redirecting monastic resources toward the army and the state. Thus, iconoclasm became a tool for centralization and reform, rather than merely a means of religious purification. At the same time, Constantine cultivated the image of a victorious and divinely favored ruler. His military successes against Arab forces reinforced the belief that iconoclasm had restored God’s favor. For supporters of the policy, theology and geopolitics seemed to align.
Following the death of Constantine V, the first iconoclastic period ended abruptly. In 787, Empress Irene, serving as regent for her son, convened the Second Council of Nicaea, which restored the veneration of icons. The council carefully distinguished between worship (latreia), which is owed to God alone, and veneration (proskynesis), which could be given to icons. This theological compromise allowed icons to return without endorsing idolatry. However, the restoration was fragile. Irene’s political position was precarious, and iconoclasm continued to receive support from certain segments of the military and bureaucracy.
Iconoclasm was revived in 815 under Leo V, inaugurating a second phase that lasted until 843. This period was less violent than the first but reaffirmed how unresolved the controversy remained. Emperors continued to view iconoclasm as a means of asserting authority and restoring divine favor, while iconophiles framed their resistance as a defense of orthodoxy itself. The final restoration of icons came under Empress Theodora, who ended the iconoclastic movement in 843. This event was commemorated as the “Triumph of Orthodoxy” and continues to be celebrated in today’s Eastern Orthodox Church.
Iconoclasm was particularly destabilizing because it affected every level of Byzantine life. It was not only a theological issue; it was also political. It influenced imperial policy as well as popular religion, pitting emperors against monks, urban crowds against soldiers, and rival visions of Christian identity against one another. Unlike many doctrinal disputes, iconoclasm was visible and tangible. An icon could be smashed in public; a wall could be whitewashed overnight. In a society where sacred images were woven into daily experiences, these acts were impossible to ignore and emotionally charged. Ultimately, iconoclasm exposed a fundamental tension in Byzantium—who had the authority to define orthodoxy? Was the emperor God’s chosen guardian of the Church, or merely its protector? At its core, the century-long struggle over icons was a power struggle.
Byzantine iconoclasm was not a peripheral controversy or a moment of religious eccentricity. It was a crisis that revealed the deep interdependence of theology, politics, and society in the medieval Roman world. That the empire survived this crisis at all is remarkable. The fact that it emerged with icons firmly embedded in Orthodox Christianity shaped Eastern Christian identity for centuries. In their attempts to purify the faith and strengthen the state, the iconoclast emperors unleashed forces they could not fully control. The riots, persecutions, and theological battles of the iconoclastic age remind us that in Byzantium, ideas were never merely abstract; they were matters of empire.
Zoe Tsiami is a PhD(c) in Byzantine History at University of Thessaly. Her research interests include baptism, catechism and naming practices in the Early Byzantine period. She has published papers and taught at workshops relevant to Early Byzantine/Christian history.
Click here to read more from Zoe Tsiami
Top Image: A scene from the Chuldov Psalter, which dates to the mid-ninth century, showing John VII, the iconoclast Patriarch of Constantinople, rubbing out a painting of Christ with a similar sponge attached to a pole.
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