An Empire at War with Itself: What Was Byzantine Iconoclasm?

Imagine a World Where a Painting Could Spark a Revolution

Imagine an empire so consumed by religious fervor that the depiction of a face on a painted panel could plunge it into civil war. This was the reality of the Byzantine Empire for over a century. From 726 to 843 AD, a violent, soul-searching conflict known as the Iconoclasm Controversy ripped through society, pitting neighbor against neighbor, monk against soldier, and emperor against pope. The central question was deceptively simple yet profoundly complex: Is it holy to create and venerate images of Christ and the saints, or is it a forbidden act of idolatry?

The term “Iconoclasm” literally means “image-breaking.” The opposing sides were the Iconoclasts (those who sought to destroy the images) and the Iconodules or Iconophiles (those who defended and venerated them). This was far more than an artistic debate; it was a battle for the very soul of the empire, touching on the deepest theological doctrines, imperial power, and the fundamental identity of Eastern Christianity. It was a century-long ideological war, fought with edicts and armies, treatises and torture, that left an indelible mark on the art, politics, and faith of the Western world.

The Seeds of Conflict: Why Did a Christian Empire Turn Against Its Own Art?

By the early 8th century, icons were everywhere in the Byzantine world. Painted wooden panels, magnificent church mosaics, and gilded frescoes adorned public and private spaces. For the faithful, these were not mere decorations; they were windows into the divine, powerful conduits for prayer and points of contact with the holy figures they represented.

A Culture of Icons: The Thin Line Between Veneration and Worship

For many Byzantines, icons were an integral part of daily life. They were kissed, bowed to, and carried in processions. People lit candles and burned incense before them, praying for miracles and intercession. However, this deep reverence created anxiety. Theologians and laypeople alike began to worry that the line between veneration (proskynesis), a respectful honor paid to the person represented in the icon, and worship (latreia), which is due to God alone, was becoming dangerously blurred. Critics saw illiterate peasants seemingly praying to the wood and paint, not through it to God, and feared the empire was sliding into the sin of idolatry, a direct violation of the Second Commandment.

A theological diagram explaining the Byzantine concept of veneration (proskynesis) versus worship (latreia), showing arrows of reverence directed differently for icons and God.
A theological diagram explaining the Byzantine concept of veneration (proskynesis) versus worship (latreia), showing arrows of reverence directed differently for icons and God.

Whispers from the East: The Influence of Aniconic Islam and Judaism

The Byzantine Empire did not exist in a vacuum. It was in a state of constant, existential conflict with the rapidly expanding Islamic Caliphate. Both Islam and Judaism are strictly aniconic—they forbid the use of images in worship. Byzantine churchmen and officials, observing the military successes of the Caliphate, began to wonder if God was favoring the Muslims because they maintained a “purer” form of worship, free from the taint of idols. This sense of religious inferiority and the desire to purify their own faith created fertile ground for an anti-image movement.

Signs of Wrath: Volcanoes, Defeats, and the Emperor’s Fear of God’s Anger

To the medieval Byzantine mind, there was no separation between state affairs and divine will. Military defeats, plagues, and natural disasters were not random events; they were signs of God’s displeasure. In the years leading up to 726, the empire suffered a series of devastating setbacks against Arab and Bulgar forces. Then, a massive undersea volcanic eruption in the Aegean Sea threw the capital, Constantinople, into a panic. For the new, energetic Emperor Leo III, the message was clear: God was angry with the empire, and the rampant use of icons was the cause. He believed it was his sacred duty as God’s regent on Earth to cleanse the empire of this sin and restore divine favor.

The First Iconoclasm (726-787): The Emperor’s Hammer Falls

Driven by military piety and a conviction that he was saving his people, Emperor Leo III launched the first official assault on images, sparking decades of turmoil.

A conceptual portrait of a stern Byzantine Emperor Leo III, robed in imperial purple and gold, pointing with an authoritative gesture towards a religious icon, commanding its removal.
A conceptual portrait of a stern Byzantine Emperor Leo III, robed in imperial purple and gold, pointing with an authoritative gesture towards a religious icon, commanding its removal.

The Spark: Leo III and the Christ Icon of the Chalke Gate

The conflict erupted into public view around 726-730 AD. Leo III ordered his soldiers to climb a ladder and destroy a large, revered icon of Christ that stood over the Chalke Gate, the main ceremonial entrance to the Great Palace of Constantinople. A crowd of outraged citizens, mostly women, gathered to defend the icon. In the ensuing riot, they murdered the officer in charge. The emperor responded with force, and the first blood of the Iconoclast Controversy was spilled. This single act symbolized the beginning of a brutal, empire-wide campaign to remove and destroy religious images from churches and public spaces.

The Enforcer: The Ruthless Campaign of Constantine V “the Dung-named”

If Leo III started the fire, his son and successor, Constantine V, fanned it into a raging inferno. Constantine was a brilliant military commander and a fierce ideologue who pursued Iconoclasm with ruthless zeal. His opponents gave him the derogatory nickname Kopronymos (“the Dung-named”), but his effectiveness was undeniable. In 754, he convened the Council of Hieria, a gathering of Iconoclast bishops who formally declared the veneration of icons a heresy. This council argued that any material depiction of Christ was heretical: either it attempted to depict only his human nature, thus wrongly dividing it from the divine (Nestorianism), or it tried to contain his divine nature in wood and paint, which was impossible and blasphemous. This gave his campaign theological legitimacy, and he then unleashed a violent persecution, targeting monks, who were the most staunch defenders of icons. Monasteries were seized, and monks were publicly humiliated, blinded, or executed for refusing to renounce their icons.

The Resistance: John of Damascus and the Theological Defense of Icons

While emperors raged in Constantinople, the most powerful defense of icons came from a monk and scholar living safely outside the empire’s borders in Muslim-controlled Damascus. John of Damascus articulated the core theological argument for the Iconodules, an argument rooted in the Incarnation of Jesus Christ. He argued that while the invisible God cannot be depicted, God became visible and material in the person of Jesus.

I do not worship matter, but the Creator of matter, who for my sake became matter and deigned to live in matter, and who through matter effected my salvation.

To create an icon of Christ, therefore, was not to depict the invisible Godhead, but to affirm the reality of the Incarnation—that Christ had a real, human body. To refuse to depict Christ, he claimed, was to deny His humanity. This brilliant defense provided the intellectual and spiritual foundation for the Iconodule resistance.

A thoughtful Byzantine monk, representing John of Damascus, sits in a dark, candle-lit scriptorium, diligently writing a theological treatise in defense of icons with a quill and ink.
A thoughtful Byzantine monk, representing John of Damascus, sits in a dark, candle-lit scriptorium, diligently writing a theological treatise in defense of icons with a quill and ink.

An Empress Intervenes: The First Restoration of Images (787-814)

The first wave of Iconoclasm ended not with a theological debate, but with a shift in political power driven by a determined woman.

Empress Irene and the Seventh Ecumenical Council of Nicaea

After the death of Constantine V’s successor, his wife, the Empress Irene, took power as regent for her young son. An Iconodule at heart, she skillfully maneuvered to reverse the half-century-old policy. In 787, she convened the Seventh Ecumenical Council in Nicaea. This council, attended by representatives from the Pope in Rome, formally condemned Iconoclasm as a heresy and officially restored the veneration of icons. It carefully defined the distinction between veneration for icons and worship reserved for God, cementing the theology of John of Damascus as official doctrine.

A Fragile Peace: The Return of the Iconodules

For a few decades, peace returned. Mosaics were restored, new icons were painted, and the Iconodules celebrated their victory. However, the military faction within the empire, which had seen its greatest successes under the Iconoclast emperors, remained resentful and suspicious. They associated the return of icons with a decline in military fortunes, and they were simply waiting for an opportunity to strike back.

The Second Iconoclasm (815-843): The Final Fury

The peace proved fragile. A new wave of military defeats convinced a new emperor that the policies of the past were the only way to secure God’s favor.

A conceptual image of Byzantine Emperor Leo V linking military defeats on a map to the use of icons, motivating his decision to reinstate Iconoclasm.
A conceptual image of Byzantine Emperor Leo V linking military defeats on a map to the use of icons, motivating his decision to reinstate Iconoclasm.

Leo V and the Return to “Proven” Policies

In 813, Emperor Leo V the Armenian, a successful general, came to the throne. Facing renewed threats from the Bulgars, he became convinced that the empire’s military weakness was due to the sin of idolatry. He saw the reigns of Leo III and Constantine V as a golden age of military victory and decided to reinstate their successful religious policy. In 815, Iconoclasm was declared the official policy of the empire once again, and a second, though less violent, period of persecution began.

The Last Stand of the Iconoclasts

The Second Iconoclasm lasted for nearly three decades but never achieved the same intensity as the first. The theological arguments had been largely settled, and the Iconodule position was well-established and deeply rooted in the populace. The controversy sputtered on, enforced by emperors but lacking popular support, until another empress intervened to end it for good.

The Triumph of Orthodoxy: How the Icons Won for Good

The final restoration of the icons was a moment of profound celebration that is still commemorated in the Eastern Orthodox Church today.

A grand, cinematic scene depicting Empress Theodora leading a procession with her young son into the Hagia Sophia, surrounded by clergy holding newly restored, gleaming icons aloft.
A grand, cinematic scene depicting Empress Theodora leading a procession with her young son into the Hagia Sophia, surrounded by clergy holding newly restored, gleaming icons aloft.

Empress Theodora and the Final Proclamation of 843

Following the death of the last Iconoclast emperor, Theophilos, his widow, Empress Theodora, assumed the regency for her infant son, Michael III. Like Irene before her, Theodora was a secret Iconodule. She moved decisively, deposing the Iconoclast patriarch and convening a synod in Constantinople. In March of 843, she presided over a grand procession to the Hagia Sophia, restoring the icons to the city’s churches in a ceremony that became known as the “Triumph of Orthodoxy.” This event marked the final, definitive defeat of Byzantine Iconoclasm.

Why the Iconodules Ultimately Prevailed

The Iconodules won because their position was more than just a preference for art; it was a profound statement about the nature of the Christian faith. Their victory affirmed the centrality of the Incarnation—the belief that God became man. The icons stood as a perpetual visual sermon, declaring that the spiritual could be made manifest in the material world. Furthermore, the deep devotion of the monks and the general populace to the icons proved to be a force that imperial edicts could not overcome in the long run.

The Lasting Scars and Legacy of Iconoclasm

The war on images left deep and lasting scars on the Byzantine Empire and the wider Christian world.

A split-panel image showing the legacy of Iconoclasm: on the left, a damaged, whitewashed Byzantine fresco with hints of color, and on the right, a vibrant, fully realized Orthodox icon representing artistic rebirth.
A split-panel image showing the legacy of Iconoclasm: on the left, a damaged, whitewashed Byzantine fresco with hints of color, and on the right, a vibrant, fully realized Orthodox icon representing artistic rebirth.

The Artistic “Dark Age”: What Was Lost and How Art Was Reborn

The most immediate consequence was the catastrophic loss of art. An untold number of mosaics, frescoes, and portable icons from the early Christian period were destroyed. This created a century-long gap in Byzantine artistic production, a veritable dark age for religious art. When art-making resumed after 843, it did so with a renewed vigor. The art of the subsequent Macedonian Renaissance was transformed by the controversy, embracing a more standardized, serene, and transcendent style. Figures became less naturalistic and more ethereal, designed to draw the viewer’s mind away from the earthly and towards the divine, a direct reflection of the theology that had won the day.

The Great Schism’s Prelude: Pushing Rome and Constantinople Apart

The Iconoclast Controversy drove a massive wedge between Constantinople and Rome. The Popes in Rome consistently and fiercely defended the use of icons, condemning the Byzantine emperors as heretics. This theological and political conflict severely weakened the ties between the Eastern and Western branches of Christianity, contributing to the growing estrangement that would ultimately culminate in the Great Schism of 1054.

Defining an Identity: How the Controversy Forged Modern Orthodoxy

Ultimately, the struggle over icons helped to forge the very identity of Orthodox Christianity. The Triumph of Orthodoxy is not just celebrated as a victory for art, but as a victory for correct doctrine. The profound theology defending icons became a cornerstone of Orthodox belief, emphasizing a faith that is tangible, visible, and deeply connected to the material world as a vessel for the divine.

Conclusion: More Than Just a Fight Over Pictures

The Byzantine Iconoclasm controversy was one of history’s most dramatic examples of how deeply art and belief can be intertwined. It demonstrated that an image is never just an image; it is a container of meaning, identity, and power. The war over icons was a fight for the definition of Christianity, a struggle that pitted imperial authority against popular piety, and a conflict that ultimately shaped the artistic and religious destiny of Eastern and Western Europe.

This century of conflict forces us to consider the power that images hold in our own lives. What do you think is the proper role of art in religion and public life today? Can an image ever become too powerful? Let us know your thoughts in the comments below.