Throughout the world, images of the cross adorn the walls and steeples of churches. For some Christians, the cross is part of their daily attire worn around their necks. Sometimes the cross even adorns the body of a Christian in permanent ink. In Egypt, among other countries, for example, Christians wear a tattoo of the cross on their wrists. And for some Christians, each year during the beginning of Lent, they receive the cross on their foreheads in ash.

Clearly, today the cross is accepted as the most popular symbol of Christianity. But, interestingly, most scholars believe that early Christians did not use the cross as an image of their religion because crucifixion evoked the shameful death of a slave or criminal.

Scholars believe that the first surviving public image of Jesus’s crucifixion was on the fifth-century wooden doors of the Basilica of Santa Sabina, which is located on the Aventine Hill in Rome. Since it took approximately 400 years for Jesus’s crucifixion to become an acceptable public image, scholars have traditionally believed that this means the cross did not originally function as a symbol for Christians.

Jesus and the cross: Jesus’s crucifixion is displayed on the fifth-century C.E. wooden doors of the Basilica of Santa Sabina in Rome. Photo: Jim Forest.

So how, then, did the cross become the preeminent symbol of Christianity?

The Cross in the Roman World

The word “cross” was offensive to Romans. One Roman insulted another by using it on a graffito discovered in the Stabian baths of Pompeii: “May you be nailed to the cross!” Classical texts similarly use the term “cross” in curses. The Roman writer Plautus, for instance, uses the phrase “go to an evil cross” as slang for “go to hell” (e.g., Pseudolus 331). In fact, even the Latin word for cross (crux) sounded harsh to the ears, according to St. Augustine (De Dialectica 10.10).

In 70 B.C.E., Cicero accused a former governor of Sicily named Gaius Verres of crucifying a Roman citizen. According to Verres, the Roman citizen named P. Gavius was guilty of espionage. Cicero reports that while Gavius was flogged in the marketplace, the only sounds from his lips were the words, “I am a Roman citizen.” Despite his claim of Roman citizenship, a cross was prepared for him. “Yes, a cross,” says Cicero, was prepared for this “broken sufferer, who had never seen such an accursed thing till then” (Against Verres 2.5.162). Worst of all, Verres ordered for Gavius to be crucified on the shore facing the Italian mainland since he claimed Roman citizenship. This incident recorded in Cicero’s speech against Verres reveals that, at least for Roman elites, crucifixion was extremely rare to witness or suffer.

Unlike the Roman elites, slaves and members of the lower class were unfortunately very familiar with the cross. In a play by Plautus, a slave comments that his death on the cross is inevitable: “I know that the cross will be my tomb; there my ancestors have been laid to rest, my father, grandfather, great-grandfather, great-great-grandfather” (The Braggart Soldier 372–373). Slaves, in fact, could be crucified for even the smallest mistakes.

The Romans primarily reserved crucifixion for criminals and rebellious foreigners. The first-century Jewish historian Josephus records numerous instances when the Romans crucified fractious Jews in Palestine (e.g., Wars of the Jews 2.75). Of course, when the Romans crucified rebels and criminals, the cross was more than a penalty; it was also a deterrent. For instance, the Romans crucified Spartacus and his rebellious slaves on the Appian Way for everyone to see from Capua to Rome (Appian, The Civil Wars 1.120). A long row of crosses with rebellious slaves fastened to them must have discouraged other slaves from similarly revolting against their masters.

As the most extreme penalty in the Roman world, a person could suffer crucifixion in several ways. Seneca recalls seeing victims with their head down to the ground, others who had their private parts impaled, and still others with outstretched arms (De Consolatione ad Marciam 6.20.3).

When not impaled, the condemned person usually carried the horizontal beam called the patibulum to the place of execution outside the city walls. Either a soldier or public executor fastened the condemned person who was naked or wearing a loincloth to the cross with ropes or nails. Material evidence suggests that a person’s feet were nailed separately on each side of the vertical beam of the cross. A crucifixion image discovered in Puteoli, Italy, for instance, shows a man, who had been severely flogged, with outstretched arms and feet nailed separately to the vertical beam.

The crucifixion image from Puteoli, Italy.

An ankle bone pierced with a nail found at Givat ha-Mivtar likewise attests to the practice of using one nail per foot.6 Finally, after the humiliating procession to the place of execution and the preparations for crucifixion were completed, the Romans raised the cross high in the air, so as to allow people to see the condemned person die from a long distance.7

The crucified ankle bone of a man named Yehohanan found at Givat ha-Mivtar is the only archaeological evidence yet found of the Roman practice of crucifixion. Photo: Israel Museum/P. Lanyi.

To die on the cross was not only humiliating, but a slow and agonizing experience—sometimes lasting days. St. Augustine suggests that the purpose of crucifixion was to inflict as much pain as possible while prolonging death (Tractate 36.4 [John 8:15–18]). Of course, in order to maximize the amount of pain inflicted on an individual, the Romans typically tortured the victim before fastening them to the cross.

While medical theories traditionally assert that people died on the cross from asphyxia (respiratory failure), recent studies contend that the victims most likely died because of a variety of physiological factors. Regardless of the actual cause of death, crucifixion was a slow and excruciatingly painful death.

Christians and the Cross in the First Century

Each of the Synoptic Gospels recounts that at the moment of Jesus’s deepest agony as he hung on the cross, the soldiers and people in the crowd mocked him, saying, “Save yourself, and come down from the cross!” (Mark 15:30; Matthew 27:40–44; Luke 23:37–39). This sarcastic insult may certainly reflect the attitude of Jewish and Greco-Roman audiences when they first heard Paul and other early Christians preach in the first century. Simply put, their message about a crucified messiah and son of God who did not have the power to save himself from the cross seemed offensive to the Jews and foolish to Greeks and Romans (1 Corinthians 1:23).

Although the very word “cross” was so repulsive that Cicero and other Roman elites wanted nothing to do with it, each of the Gospel writers recounts Jesus’s crucifixion with astonishing detail. Jesus’s death on the cross, according to Mark, is not only necessary but an example of the service required for true discipleship (8:34–38). Similarly, Jesus’s death on the cross is not portrayed as being shameful or humiliating in John’s Gospel; there Jesus’s crucifixion is envisioned as a saving event foreshadowed by Moses when he lifted up the serpent in the wilderness (John 3:14).

Despite its negative connotation to Jews, Greeks, and Romans, Paul repeatedly uses the word “cross” in his letters when responding to the conflicts created by his opponents (e.g., Galatians 2:18–20). Interestingly, Paul may have deliberately focused on the modality of Jesus’s death on the cross for at least two reasons. First, Paul most likely knew that, although his message about the cross was not going to easily appeal to his Jewish and Greco-Roman audiences, still it would certainly attract their attention. And second, the Jewish and Gentile criticism of Jesus’s crucifixion may have encouraged Paul to focus even more of his attention on this gruesome subject since he believed Jesus demonstrated his selflessness, humility, and abundant love for humanity by suffering on the cross.

By the end of the first century, some Christians already may have viewed the cross as a significant symbol. For example, in the last decade of the first century, the author of the Book of Revelation may have referred to the mark of the cross in the seal that the servants of God receive on their foreheads (Revelation 7:2–3). Thus, the Book of Revelation possibly refers to the cross as a Christological identity marker.

Christians and the Cross in the Second and Third Centuries

Greek and Roman elites continued to criticize Christians because of their veneration of the crucified Jesus in the second century. Perhaps the most explicit criticism came from the second-century Greek philosopher Celsus, who called the manner in which Jesus died “the most humiliating of circumstances” (On the True Doctrine 3).

It was common knowledge in the second and third centuries—even among the poorer classes of the Roman Empire—that the founder of the Christian movement suffered the most shameful death as suggested by the well-known Palatine graffito discovered in the imperial training school for slaves in Rome in 1857. This graffito depicts a donkey’s hands nailed to the horizontal beam of a cross. A person beneath the cross, who is dressed like a slave in a short-sleeved shirt that extends from the shoulder to a little below the waist, gazes upward at the crucified victim in adoration as suggested by the inscription: “Alexamenos, worships god.” Most likely, although it is not certain, the context of this graffito is one slave mocking another for worshiping the crucified Jesus. The inspiration for this satirical image of Jesus’s crucifixion may trace back to the Greek and Latin authors who accused Christians, like the Jews, of worshiping a donkey. In any case, the graffito indicates that even the poorer social classes criticized the Christian belief in the crucified Jesus with sarcastic enjoyment.

The so-called Alexamenos graffito.

Although the image of Jesus on the cross was not very popular in the second and third centuries, still scholars have identified at least a few instances in which Christians depicted it. Perhaps the earliest portrayal of the cross by Christians occurred in the iconography of their papyrus manuscripts, specifically the Staurogram, or shape of the cross made by the overlapping of the Greek letters “Rho” and “Tau”. A more obvious depiction of the cross is seen in a third-century gem in the British Museum, which depicts a crucified Jesus with an inscription that lists various Egyptian magical words. Furthermore, some Christians continued to mark their forehead with the image of the cross in the second and third centuries as an identity marker (e.g., Revelation 7:2–3; cf. Tertullian, On Crowns 3). Moreover, some scholars argue that the depiction of figures with outstretched arms in early Christian artwork may be the archetype representation of Jesus on the cross. Such a theory is supported by second- and third-century Christian texts, which mention Christians (especially martyrs) making the sign of the cross by stretching out their arms (e.g., Odes of Solomon 27; Acts of Paul and Thecla 22).

This third-century C.E. gem in the British Museum depicts Jesus’s crucifixion with an inscription that lists various Egyptian magical words. Photo: British Museum/CC BY-NC-SA 4.0.

During the second and third centuries, Christians were aware that the cross was still what Paul calls a “stumbling block for the Jews and foolishness for Greeks and Romans” (1 Corinthians 1:23), and most Christians were reluctant to depict it. Nevertheless, the rhetoric of the Christian apologists, such as Justin the Martyr and Tertullian, may have encouraged at least some Christians to illustrate the cross in their art and iconography. Thus, by the end of the third century, what had once been universally a repulsive image in the ancient Mediterranean world was well on its way to becoming the preeminent symbol of Christianity.

Symbol in the Sky

In his history of the Christian Church written in the fourth century, Eusebius of Caesarea recounts that the gesture of outstretched hands used by Christian martyrs in the arena represented Jesus’s crucifixion (History of the Church 8.7.4). If Eusebius’s account is historically accurate, then the gesture of outstretched arms was widely recognized by Christians and non-Christians alike.

Undoubtedly, though, Constantine’s adoption of the cross was the most important development that resulted in its becoming the preeminent symbol of Christianity.

According to Eusebius, the day before the Battle of Melvian Bridge, Constantine earnestly prayed for victory against his co-emperor Maxentius. Constantine’s prayer was answered, and a most marvelous sign appeared to him from heaven. Eusebius relates that Constantine saw a cross of light in the sky, above the sun, bearing the inscription, “Conquer by this” (Life of Constantine 28). That night, Eusebius reports, Jesus explained to Constantine the meaning of the vision. Constantine was directed by Jesus to create a new banner with the symbol of the cross created by the Greek letters “Chi” and “Rho.” This well-known symbol in Christianity, which is usually referred to as the Chi-Rho, became known as the standard of the cross.

According to the fifth-century Christian historian Sozomen, Constantine abolished crucifixion in special reverence for the power and victory he received because of the symbol of the cross (History of the Church 1.8). This abolishment certainly changed the Roman perception of the cross. Simply put, Constantine’s public endorsement of the cross changed its connotation from a repulsive device for executing slaves, foreigners, and Roman citizens of low social standing into a revered, public symbol.

Constantine did not create the symbol of the cross. Rather he adopted it as a new symbol for his empire that had converted to Christianity. Of course, this means that when the artisans depicted the crucified Jesus on the wooden doors of Santa Sabina in the fifth century, the cross was no longer an offensive image. Rather the image of the cross had already transformed from an execution device to a symbol of Christianity. And soon the image of the crucifix would adorn the walls and steeples of churches throughout the world, making the cross the preeminent symbol of Christianity.

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