3. A ‘world full of gods’ is Keith Hopkins’s phrase in his engagingly quirky study of Roman religions, A World Full of Gods: Pagans, Jews and Christians in the Roman Empire (Weidenfeld and Nicolson, 1999).

Citizenship brought with it all kinds of specific rights under Roman law, covering a wide range of topics, from contracts to punishments. The simple reason that, in the 60s CE, Saint Peter was crucified while Saint Paul enjoyed the privilege of being beheaded was that Paul was a Roman citizen.

At the same time, the success of Christianity was rooted in the Roman Empire, in its territorial extent, in the mobility that it promoted, in its towns and its cultural mix. From Pliny’s Bithynia to Perpetua’s Carthage, Christianity spread from its small-scale origins in Judaea largely because of the channels of communication across the

The same was true, in a sense, of Judaism. But to a remarkable and in some ways unexpected degree, the Jews managed to operate within Roman culture. For the Romans, Christianity was far worse. First, it had no ancestral home. In their ordered religious geography, Romans expected deities to be from somewhere:

Whatever the letter of the law or the precise circumstances of any individual trial, there was an irreconcilable clash between traditional Roman values and Christianity. Roman religion was not only polytheistic but treated foreign gods much as it treated foreign peoples: by incorporation.

The truth is that for two centuries after the crucifixion of Jesus sometime in the early 30s CE, Christianity is hard to pin down. It started as a radical Jewish sect, but how and when it became clearly separated from Judaism is impossible to say.

Most memorably of all, in Tacitus’ biography of his father-in-law, one of Rome’s enemies, as part of a set-piece speech delivered before he enters battle with Agricola, challenges Roman rule and what it adds up to. The Romans, he insists, are the robbers of the world, insatiable for domination and profit. And in a much-quoted phrase that still hits

And for the first time, at the start of another long tradition whose origins lie in the Roman Empire, a substantial quantity of wine was being made in what is now France, outperforming the Italian vintages.

And soon, as Tacitus put it, the Britons were dressing up in togas and taking their first steps on the path to vice, thanks to porticoes, baths and banquets. He sums this up in a pithy sentence: ‘They called it, in their ignorance, “civilisation”, but it was really part of their enslavement’ (‘Humanitas vocabatur, cum pars servitutis esset’).