Reading Lightning: The Etruscan Fulgural Doctrine

If you walked around a Roman town you would occasionally come across a small walled enclosure with nothing inside it. No statue, no altar, no shrine. Just an area of ground, fenced, that nobody was permitted to step on.

Something had been buried there. Not a person. A lightning strike.

The scorched earth, and whatever the bolt had hit, had been gathered up by a specialist and interred on the spot with a sacrifice. The place was then enclosed and left alone, permanently. Disturbing one was a religious offence serious enough that Roman poets used it as a byword for reckless sacrilege.

This was not a superstition Rome picked up from the street. It was imported doctrine, from a system Rome regarded as technical expertise, and it had books.

The branch of the discipline that dealt with the sky

The Romans called the whole Etruscan religious system the Etrusca disciplina, and divided it in three: the books on reading entrails, the books on ritual law, and the libri fulgurales: the lightning books.

Not one page of any of them survives. What we have is Roman writers quoting and paraphrasing, principally Pliny, Seneca and Cicero, which means we have the framework of the doctrine and almost none of its actual readings.

The framework alone is remarkable.

Sixteen regions, each with an owner

Start with the sky, because everything hangs off it.

Etruscan doctrine divided the heavens into sixteen parts. Pliny sets out the scheme: four quarters, north to east, east to south, south to west and west back to north, each subdivided into four. The eight regions running from the east were called the left-hand ones, and the eight opposite them the right.

Each region belonged to a deity.

Which means a thunderbolt was not a weather event with a meaning attached. It was a message with a return address. The quarter it came from told you who had sent it, and the left-right division told you, broadly, whether this was good news.

Then the reading was refined by the particulars: what it struck, where it went afterwards, what time of day, what was happening at the time.

That sixteenfold division is also where this doctrine connects to a surviving object. The bronze liver found near Piacenza has sixteen compartments around its rim, inscribed with divine names: a diviner's model of the sky, in his hands, matching the scheme the Roman sources describe. Two entirely separate branches of the discipline, using one map.

Nine gods, eleven kinds of bolt

Pliny reports that Etruscan writers counted nine gods entitled to hurl thunderbolts, producing eleven varieties, because Jupiter throws three different sorts.

Then he adds a detail that is quietly devastating about cultural borrowing: the Romans kept two. Jupiter for bolts by day, and Summanus, an obscure god almost nobody could tell you anything about, for bolts at night.

Rome adopted the discipline, maintained an official order of practitioners, consulted them for eight centuries, and simplified a nine-deity system down to a two-deity one on the way in.

Jupiter's three bolts are worth spelling out, because Seneca preserves the distinctions and they are not what you'd expect. The first is a warning, and Jupiter sends it on his own authority. The second he sends only after taking the advice of twelve other gods; it does good, but it does harm on the way. The third requires the consent of a group Seneca calls the veiled or superior gods, and it destroys: it changes the state of things, publicly or privately, permanently.

Those veiled gods are the strangest item in Etruscan religion. Deities above Jupiter, whose names and number were not known, and were apparently not knowable. A supreme god who needs a committee's permission for the serious weapon, and the committee is anonymous.

The one sentence that explains the whole system

Seneca puts his finger on what actually separates this from Roman natural philosophy, and it isn't credulity.

The difference between us and the Etruscans, he writes, is that we think lightning is discharged because clouds have collided; they think clouds collide in order that lightning be discharged.

Read it twice. The physics isn't in dispute. Both sides agree that clouds collide and lightning results. What's in dispute is which way the causation runs: whether the meaning is a consequence of the event, or the event is a consequence of the meaning.

Because they refer everything to the gods, Seneca goes on, they hold that things do not carry a significance because they have happened; they happen in order to signify.

That is a coherent intellectual position, and it is the foundation of the entire discipline. In a universe where events occur in order to communicate, a specialist who can decode them is not a mystic. He's a translator, and the sky is a text.

It also explains why the doctrine is so relentlessly procedural. If the message is real, getting the reading right matters, and so does the reply.

The paperwork of a thunderbolt

Which brings us back to the empty enclosure.

When lightning struck, the response was not panic. It was a defined process, carried out by a qualified person, with a correct order of operations.

The strike was located. What it had hit was collected: the scorched material, the fragments, whatever had been destroyed. That material was buried at the site. A sheep was sacrificed: a bidens, an animal of a particular age, and the name of the sacrifice gave the enclosure its own name, bidental. The ground was then walled off and permanently withdrawn from use.

The Romans described the buried strike with a phrase that gives the whole thing away: fulgur conditum: the lightning, laid to rest. The same verb used for burying the dead.

A bolt from the sky was treated as an object that had arrived, done its work, and now required disposal under religious law. There was a right way to file it.

What's left

The discipline outlasted the people who invented it by a very long way. Haruspices were still in Roman state service in the fourth century CE, and in 408, with Alaric's army outside the walls, they are reported to have offered to call lightning down on the Goths. The offer was declined.

And then the books went, along with everything else in the Etruscan sacred library. The language itself has never been recovered well enough to read the fragments we do have, so even the pieces are locked.

What survives is a description of a filing system: sixteen owned regions of sky, nine gods with throwing rights, three grades of Jupiter's bolt, a nameless committee above him, and a burial rite for weather.

Not a single recorded reading. We know exactly how they were supposed to interpret a thunderbolt, and not one instance of what any thunderbolt was held to have said.