Introduction

When the Emperor Tiberius died in AD 37, the empire — and Judea in particular — was ready for change.
Years of suspicion and repression had left the people weary.

Into that moment stepped Gaius Julius Caesar Germanicus — better known by his childhood nickname, Caligula, “little boots.”
At first, he was welcomed as a breath of fresh air: the beloved son of the popular general Germanicus, a man whose family name still inspired loyalty in the legions.

But within months of taking the throne, Caligula’s rule took a shocking turn.
A serious illness changed him — or perhaps revealed him.
He began to speak and act as if he were not just Rome’s ruler, but Rome’s god.

Caligula’s four-year reign takes us into the early chapters of the book of Acts — roughly Acts 8 through Acts 11, and possibly touching Acts 12. This is the period after Stephen’s martyrdom, when Saul is converted, the gospel spreads to Samaria, and the first Gentiles come to faith.
In Acts 11:26 we read, “The disciples were first called Christians in Antioch.”
That moment, the birth of the Christian name, happens right around the time Caligula is assassinated.

At this stage in history, Christians were still viewed by Rome as part of the Jewish community. There was no legal distinction between them. Because of that, they came under the same imperial pressures as the Jews — but their primary opposition, as the book of Acts records, came from certain Jewish religious leaders, not directly from Rome.

Demanding Worship

Caligula’s early popularity soon gave way to demands for divine honors.

Cassius Dio, Roman History 59.28 (c. AD 200–235):
“He gave orders that the statue of Zeus at Olympia be brought to Rome, in order that he might set up a statue of himself in its place, and be worshipped as Zeus.”

Suetonius, Caligula 22 (c. AD 110–130):
“He demanded that all statues of the gods be brought to Rome and have his image set upon them.
Those who failed to swear by his Genius or sacrifice to him were executed or exiled.”

Cassius Dio, Roman History 59.6:
“He became terribly bloodthirsty, once stained with blood. He killed without trial anyone he suspected.
And because he was now calling himself a god, any slight was counted as sacrilege.”

Cassius Dio, Roman History 59.25:
“In Gaul he executed many nobles who failed to show delight at his arrival.
Some were accused of mocking the temples erected in his honor.”

These weren’t harmless eccentricities. Caligula’s divine pretensions were enforced with political terror. Refusal to participate in his worship could mean exile, confiscation of property, or death — whether you were a senator in Rome or a provincial subject.

Christians Were Still Seen as Jews

In the late 30s AD, the Roman state made no distinction between Jews and Christians.

The followers of Jesus still met in synagogues. They kept many Jewish customs. Their proclamation of a crucified and risen Messiah looked, to outsiders, like one more messianic variation within Judaism.

That meant that when Jews came under threat for refusing emperor worship, Christians came under the same threat — not because Rome recognized them as a separate group, but because they were still identified as Jews.

It’s important to remember: in this period, as Acts records, the primary persecution of Christians came from Jewish religious authorities and their allies, not from the Roman state.

The Temple Statue Order

Caligula’s most infamous act toward the Jews came in AD 39 or 40, when he ordered a colossal statue of himself to be placed in the Jerusalem Temple — the holiest site in Judaism.

Josephus, Antiquities 18.261–262 (c. AD 93):
“Petronius, the governor of Syria, was astonished at the constancy of the Jews… Tens of thousands came to meet him, begging him not to allow the laws of their forefathers to be transgressed. They threw themselves on the ground and exposed their necks, declaring they were ready to be slain rather than see the image set up.”

Josephus, War 2.195 (c. AD 75):
“They continued in this posture for forty days, lying prostrate on the ground and praying with tears that the laws of their forefathers not be violated.”

Josephus, Antiquities 18.278:
“They said they would rather let their land lie untilled than submit to such impiety. ‘We will neither fight nor flee,’ they said, ‘but if you wish, kill us. Slaughter us as sacrifices upon our own soil, and we shall die satisfied if we keep our Law.’”

This was a theological line that could not be crossed. The Jewish resistance was total and nonviolent, but it risked triggering a rebellion that could have spread far beyond Judea.

Philo Stands Before Caligula

In Alexandria, Jews were being attacked. Synagogues were seized. A delegation led by Philo of Alexandria (c. AD 40s) was sent to plead their case before Caligula.

Philo’s description in Embassy to Gaius is striking.

Philo, Embassy to Gaius 206:
“He would run to the peacocks and talk to them, then dart off to a cluster of trees… laughing loudly and pretending to judge the beauty of the statues.
We followed him like prisoners in a triumphal procession.”

Philo, Embassy to Gaius 351–352:
“He ridiculed us without restraint.
He said, ‘You are people who do not believe I have been made a god, although I am clearly one!’
And when we tried to explain our ancestral customs, he laughed louder still and said,
‘You are not defending your religion — you are insulting mine!’”

Philo, Embassy to Gaius 358:
“No one could guess what he would do next.
His madness was like the sea, stirred by contrary winds — always shifting, never at peace.”

The emperor’s mood, not the law, was the deciding factor for the fate of entire communities.

Petronius Risks His Life

In Judea, the man tasked with carrying out the statue order was the governor of Syria, Publius Petronius. He saw the Jewish determination to resist and feared the order would ignite a rebellion that could consume the whole region.

Josephus, Antiquities 18.297–299:
“Petronius took the blame upon himself… He wrote to Caligula saying that if he forced the image into the Temple, all Syria would be in revolt.
He told his wife and children to prepare for his death.”

Caligula sent a letter ordering Petronius to commit suicide. But before it arrived:

Josephus, Antiquities 18.302:
“The letter from Caligula, commanding Petronius to kill himself, was already on its way —
but a messenger arrived first announcing that Gaius was dead. And so Petronius was saved.”

What Was Happening in the Church?

During Caligula’s reign:

• Jesus had been crucified just a few years earlier, c. AD 30.
• Paul had been converted, c. AD 31–32.
• The gospel had spread to Samaria and Antioch.
• According to Acts 11:26, “The disciples were first called Christians in Antioch.”
• The events of Acts 8–11 — and possibly into Acts 12 — take place during these years.
• The primary persecution of Christians recorded in Acts during this period came from certain Jewish authorities (Acts 8:1–3; Acts 9:1–2), not from Rome.

Conclusion

Caligula’s reign ended in AD 41 when members of the Praetorian Guard assassinated him.
For the Jews — and for Christians — his death was seen as a deliverance.

But his four years on the throne left a deep impression: the empire could demand worship from its subjects, and refusal could bring you to the brink of death.

The birth of the Christian name in Antioch happened in this very period, under the shadow of an emperor who claimed to be all the gods.

In the next post, we’ll see how the man who succeeded him — Claudius — brought a surprising period of stability, and how, under that stability, the Christian mission exploded across the empire.