As Rome and the western Empire were overrun by northern European tribes, the east rose to prominence under Justinian, the distinction between the Eastern and Western Empires became more pronounced, and Early Christian and Byzantine started to diverge.
The term "Byzantine" is derived from the city of Byzantium, the name of the style that originated in the Eastern roman Empire. It is also used to include works made in Italy under Byzantine influence. The Empire was centered in the city of Constantinople (present-day Istanbul). Though civilization proceeded along separate paths in the East and in the West, there was constant interaction between the Byzantines and the westerners from the sixth century to the fifteenth c. The idea of the Roman empire never died, and both the Byzantines and the Europeans sought, from time to time to reunite its two parts.
The geographical separation and political divergence of east and west was paralleled by a schism within the Church itself. In Rome and the western Empire, the pope was the undisputed head of the Church. The eastern branch of the Church was led by Justinian, the emperor. Justinian was convinced of his divine calling as leader of church and state as the co-regent of Christ on earth, he instituted a policy that combined temporal and religious spheres into one, whereby the emperor ruled with absolute authority as a sacred monarch, an emperor-pope. However, despite their differences in liturgical practice, theology, and politicla status, the notion of a single church of Christ never disappeared, and the two churches were often in close contact.
In the 5th century A.D., the Western Roman Empire fell to Germanic tribes, with the Ostrogoths occupying Ravenna. In 540, Emperor Justinian of the Eastern Roman (Byzantine) Empire recaptured Ravenna, signaling a resurgence of imperial power.
Under Justinian, the Byzantine Empire reached new political and artistic heights.
His armies:
Drove the Goths out of Italy
Defeated the Vandals in North Africa
Pushed back the Persians in Asia Minor
Justinian’s Architectural Legacy
Justinian launched an ambitious building campaign, leaving a lasting mark on both Constantinople and Ravenna.
His churches are known for their innovative design and rich decoration.
In San Vitale (Ravenna), the interior glows with gold mosaics, bathing the space in warm, yellow light.
The mosaics depict Christian themes and stand as some of the finest examples of Byzantine mural art.
The apse mosaic in San Vitale features a youthful, beardless Christ with a halo bearing a cross, signifying His divine authority.
Christ is shown enthroned as a king, no longer the humble Good Shepherd.
He wears imperial purple robes and is flanked by angels, echoing court iconography adapted from Roman imperial art.
Stylistic Features
While there are traces of Roman naturalism—in the landscape and light shading—the overall style is more conceptual and symbolic.
Figures are frontal, with stiff draperies that lack realistic movement.
Perspective is absent; Christ appears to hover on a globe, rather than sit with realistic weight.
The mosaic emphasizes flat patterns and iconic presence over illusionistic space.
Symbolism
Christ sits on a globe, symbolizing His role as universal ruler.
Beneath His feet (not visible in all views) are the four rivers of Paradise, representing the four evangelists who spread God's word across the world.
On the viewer’s left, facing the Enthroned Christ in the apse of San Vitale, is the famous mosaic of Emperor Justinian and his court.
Justinian wears the same imperial purple robes as Christ, a deliberate and powerful symbol of his role as Christ’s representative on Earth.
The mosaic affirms Justinian’s position as the rightful successor to Constantine, emphasized by the presence of the Chi-Rho shield, a symbol associated with Constantine’s divine authority.
His placement within the sanctuary, the holiest part of the church where only clergy could enter, implies his supremacy over both Church and State—and even a suggestion of sanctity, reinforced by the halo above his head.
He has a retinue of 12, symbolic of Christ and Apostles
Opposite the mosaic of Justinian in San Vitale is the depiction of Empress Theodora and her court.
Theodora wears a purple imperial robe and a halo, symbolizing her divine authority and status as co-regent.
She carries a liturgical offering, echoing the gifts of the Magi, which are embroidered on the hem of her garment—reinforcing her role in the sacred ritual.
Though placed on Christ’s left (a slightly less exalted position than Justinian's on the right), her presence near the altar emphasizes her power and influence.
The mosaic displays obvious hierarchic characteristics in the symmetry, frontality, stiffness of pose, centrality of Justinian. An iconic elevation of Justinian's person was intended here. He is portrayed as the saintly emperor eternally present at the celebration of the Mass in San Vitale.
We can see in both works the lack of naturalism, the love for elaborate patterns and repetition. Their diagonal feet are not supported by a three-dimensional floor. A good example of typical Byzantine disregard for perspective can be found in the fountain in Theodora's mosaic. The bowl tilts forward, which in a natural setting would spill the water forward.
Light, as expounded by the abundance of gold backgrounds, their reflected surfaces is symbolic of Christ's self proclaimed role as "light of the world".
The same spiritual quality found in the light within the mosaics is found is other Byzantine architecture as well.
The Church of Hagia Sophia in Constantinople (modern-day Istanbul) is the crowning architectural achievement of Emperor Justinian’s reign. Dedicated to Christ as Holy Wisdom (Hagia Sophia), it represents a fusion of engineering innovation, spiritual symbolism, and imperial power.
Justinian commissioned two Greek architects, Anthemius of Tralles and Isidore of Miletus, to design a new kind of church centered on a vast central dome. Completed in just six years, the dome soars 184 feet high and, together with half-domes, covers an area of approximately 100 by 250 feet.
Architectural Plan and Innovation
The challenge in Constantinople was to create a space large enough for a substantial congregation (unlike the smaller San Vitale in Ravenna), while retaining a centralized spiritual structure. The solution was a bold fusion of the basilica plan with a central dome design—a revolutionary innovation in church architecture.
The key structural solution was the use of pendentives:
Pendentives are triangular sections of masonry that transition from a square base to a circular dome.
This allowed the massive dome to rest securely atop a square base, supported by four large piers.
Half-domes on the east and west sides absorb some of the dome's thrust, expanding the space longitudinally like a basilica.
Additional semi-domes on the diagonals complete the central plan and help support the weight.
From above, the plan radiates outward from the central dome, merging vertical and horizontal space in a way that had never been done before.
Interior: Light, Space, and Spirituality
While the exterior appears heavy and earthbound—dominated by massive buttresses needed to contain the dome’s lateral thrust—the interior feels weightless and radiant.
The central dome, pierced by 40 clerestory windows, allows light to pour in, making it appear as if the dome floats above the space.
The use of gold mosaics and richly veined marble conceals the building’s structural mass, creating a sense of divine transcendence.
The entire design aims to dissolve the physical boundaries of the structure, achieving an atmosphere of heavenly majesty and spiritual elevation.