What is attested
Roman augury was a procedure for asking a question with a yes-or-no answer. The question was not "what will happen?" but "is this act, by this man, on this day, acceptable?" The technical vocabulary that survives makes this unusually clear: an auspicium was taken before an act — before a magistrate convened an assembly, before an army crossed a river or gave battle, before a magistrate entered office — and the sign that came back either licensed the act or withheld the licence. A negative answer did not forecast defeat. It cancelled the day. The act could be attempted again after the auspices were retaken, and Roman public life contains many instances of exactly that: postponement, repetition, a second and successful consultation. This is the single most important structural fact about the practice. No single passage states it; it is an inference from the shape of the technical vocabulary and from the constitutional record of business being deferred rather than abandoned.
The practitioners were the augures, a public priestly college, and their standing is well attested across the Republic and Empire. Membership was a mark of high political status; Cicero, who was elected to the college in the 50s BC, wrote about augural procedure from inside it. Later sources report that the college grew from an early figure of nine to fifteen under Sulla and sixteen under Caesar. Those numbers are literary report, not epigraphic fact, and should be handled as such. What is epigraphically secure is that men advertised the augurate on their monuments and coins alongside consulships, that the augural insignia (above all the curved staff called the lituus) functioned as a recognised badge, and that the college persisted as a state institution into the imperial period.
A crucial distinction inside the practice separates the magistrate from the priest. The right to take the auspices belonged to the magistrate who was going to act; the augur was the expert who knew the law of signs, who could be consulted, and who could pronounce that a fault (vitium) had occurred. Two sorts of sign are distinguished. The technical pair impetrativa / oblativa reaches us through later grammarians and antiquarians systematising the practice, but the distinction it marks is visible in earlier usage. Auspicia impetrativa were actively sought, within a formally defined field of observation, at a time chosen by the observer. Auspicia oblativa were unsought signs that intruded — a bird, a noise, a stumble, lightning — and these had force only if someone with standing reported them. A sign nobody announced had no legal effect. This is a procedural religion, not an oracular one.
The observational field mattered as much as the sign. An augur constituted a templum: not a building but a bounded region of sky and ground, defined by a spoken formula that named its limits. Varro preserves a version of the words used for the templum on the citadel, and the physical correlate has been excavated — at Bantia in Lucania a set of inscribed boundary stones marks out a small augural precinct, with abbreviated ritual terms cut into them. That site, dated to around the beginning of the first century BC, is the closest thing we have to an augural installation we can stand in. A platform on the Roman Arx has been proposed as the city's own auguraculum; the identification is inference from topography and Varro's description rather than an inscribed certainty.
In the field, the standard instrument was not wild birds but chickens. A pullarius travelled with the army carrying caged birds, and before action he released them and threw down feed. Eager feeding, with grain falling from the beak as the birds stamped — the tripudium solistimum — was the favourable answer. This is a sign that a competent handler can substantially manage: hungry birds feed. Roman sources acknowledge as much. Livy narrates an episode in which a pullarius reported a favourable tripudium that had not occurred, the fraud came out, and the consul's response was that the responsibility rested on the man who lied. That story, whatever its historicity, shows Romans reasoning about the practice in terms of procedural liability, not prophetic accuracy.
How the rite worked
The core operation: the person about to act, or an augur acting for him, marked out a templum with a spoken formula fixing its boundaries, then took position — traditionally seated, facing a fixed direction, at night or before dawn for the taking of the auspices of the day — and announced the sign he intended to accept. Observation was confined to the declared field. Silence was required; a noise counted as a disturbance and could vitiate the whole procedure. The observer then reported the outcome. Because the question was binary and tied to a named act, the result was operationally simple: proceed, or do not proceed today.
In public political life, the mechanism that gave augury its bite was announcement. A magistrate or, on some readings of augural law, an augur could report an adverse celestial sign and thereby stop an assembly; the formula of postponement — an instruction to reconvene on another day — was enough on its own, without argument. Business conducted in the face of such an announcement, or business later found to have been vitiated, could be declared invalid. Cicero's own legislative programme in De legibus states the principle that what an augur declares faulty is void. The best-documented working example is the consulship of 59 BC, when Bibulus withdrew and announced that he was watching the sky, an obstruction Cicero refers to in contemporary correspondence and one which supplied the legal grounds later used to attack Caesar's legislation.
On campaign the apparatus was portable and the personnel small: a commander holding auspices in his own right, a pullarius, a cage of chickens, feed. The auspices of an army were tied to the magistrate; a commander whose imperium lapsed lost them, and a subordinate acting without them was acting without cover. This is why the timing of consultations clusters around thresholds — leaving the city, crossing a boundary, engaging, entering office — rather than being spread evenly through a campaign.
Cost is not the right frame for augury; delay is. Augury was not a fee-paying consultation in the Greek sense: there was no sanctuary to travel to and no recorded charge to the enquirer. The augurate was a senatorial honour rather than a salaried post. What the practice actually charged was time and the possibility of veto, and that is precisely what made it politically valuable in the late Republic, and what makes surviving discussion of it so often a discussion about obstruction.
The evidence and its limits
Each class of evidence below is followed by what it cannot show. That second half is not a disclaimer; it is the part most accounts of ancient religion leave out.
Literary sources
Cicero (an augur himself), Varro, Livy, and later grammarians and antiquarians preserve augural vocabulary, formulae, and case law, often as direct paraphrase of the lost augural books.
What it cannot show — Almost all of it is late-Republican or later, written when augury's political uses were contested; Cicero's De divinatione in particular is a philosophical dialogue arguing about divination, not a manual, and Livy writes centuries after the events he describes.
Archaeology
The augural precinct at Bantia, with its inscribed boundary cippi, gives a physical templum of roughly the early first century BC; comparative sites such as Cosa show similarly small marked platforms.
What it cannot show — Excavated precincts show the size and orientation of an observation space but nothing about what was said, watched for, or concluded there; the readings of the abbreviated words on the cippi are themselves contested.
Images
The lituus and other augural implements appear on Republican coinage and on state reliefs, confirming a stable, publicly legible set of priestly emblems.
What it cannot show — Emblems advertise office and status; they do not depict procedure, and no ancient image gives a reliable step-by-step of a consultation.
Inscriptions
Career inscriptions record the augurate among magistracies and priesthoods, showing the college's continuity and social profile over centuries.
What it cannot show — These name office-holders and say essentially nothing about what the office-holders did on any given occasion.
What the sources do not record
The augural books themselves — the libri augurales and the college's commentarii — do not survive. Everything we have of augural law reaches us as quotation, paraphrase, or hostile summary in authors outside the college's own archive.
No ancient source gives a complete list of which birds signified what, in which quarter of the sky, under which conditions. Modern schematic tables of 'favourable' and 'unfavourable' birds are reconstructions assembled from scattered notices.
The evidence does not record the internal deliberation of the college: how augurs argued a disputed case, what precedents they cited, how a ruling of vitium was reached. We see outcomes, not reasoning.
There is no documented origin. The practice is already fully formed in the earliest sources that describe it, and the archaeological record cannot date the institution's beginning.
What the evidence supports
A small, formally bounded observation area of roughly the early first century BC, its limits marked by stones carrying abbreviated ritual terms — physical confirmation that the templum was a real surveyed space and not only a figure of speech.
Augural precinct (auguraculum) with inscribed boundary cippi (Bantia (Banzi), Basilicata, Italy; excavated and published by Mario Torelli from the 1960s).
Possibly the city's principal augural station; the identification rests on the platform's dimensions, its outlook, and Varro's description rather than on any inscription found there.
Platform on the Arx of the Capitoline identified as Rome's auguraculum (Rome, Capitoline Hill).
A non-Roman Italic ritual text that prescribes observing named birds from a fixed station before a civic lustration — direct documentary evidence that formal bird-observation before public acts was an Italic practice, not solely a Roman one.
Iguvine Tables (seven inscribed bronze tablets in Umbrian) (Found at Gubbio, Italy, in the fifteenth century; Palazzo dei Consoli, Gubbio. The seven tablets are conventionally placed between roughly the third and the first centuries BC — the earlier ones in the native Umbrian alphabet, the later in Latin script — and that range is an epigraphic estimate rather than a fixed date.).
The augurate had a fixed, publicly recognised visual signature used for self-advertisement by office-holders.
Lituus and augural emblems on Roman Republican denarii and state reliefs (Widely distributed; major numismatic and museum collections).
Stories told about the rite
Ancient writers offered these as explaining the practice. They are evidence for what the tradition said about itself, and they are not the origin of anything: each is given with the author who tells it and the distance between the two.
- Evidence level: Mythological
Told by Livy in book 1 and by Plutarch in the Life of Romulus, both writing many centuries after the events they place in the eighth century BC.
Romulus and Remus determine which of them shall found the city, and where, by taking the auspices from separate hills; Remus sees six vultures first, Romulus twelve afterwards, and the dispute over whether priority or number wins ends in Remus's death.
Offered as explaining — Why the founding act of Rome itself required auspices, and why the city's name and site belonged to Romulus — that is, it grounds augury as constitutive of Roman legitimacy rather than incidental to it.
This is a charter myth for the authority of the auspices, and it also encodes a genuine augural problem (priority versus number of signs). It is not evidence for when or how augury began, and its very neatness as a legal exemplum is a sign of literary shaping.
- Evidence level: Mythological
Related by Livy in book 1 and referred to by Cicero in De divinatione; a statue of Navius was said to stand at the Comitium.
The augur Attus Navius, challenged by king Tarquinius to confirm by augury whether what the king was silently thinking could be done, receives a favourable sign and then cuts a whetstone in half with a razor.
Offered as explaining — Why the augural college could not simply be overruled by a magistrate or a king, and why augury outranked political convenience.
The tale is explicitly an argument about jurisdiction, told in the period when that jurisdiction was politically contested. Ancient authors report a statue of Navius and the buried whetstone standing at the Comitium; nothing of either survives, and a reported memorial authenticates a memorial, not an event.
Vocabulary
- auspicium
- The taking of a sign, normally from birds or the sky, to establish whether a specific act has divine permission on a specific day. Plural auspicia. The word is built from the elements for 'bird' and 'watch'.
- templum
- A region of sky and ground formally delimited by spoken formula for the purpose of observation. Only later and secondarily does it mean a temple building.
- auspicia impetrativa / oblativa
- Signs actively sought under controlled conditions, versus unsought signs that intrude. Unsought signs had force only when someone with standing announced them.
- obnuntiatio
- The formal announcement of an adverse sign, which stopped or invalidated the public business in progress.
- vitium
- A fault in procedure — a mis-taken auspice, an ignored sign, a broken silence — which rendered the resulting act void and could require it to be done again.
- tripudium (solistimum)
- The favourable feeding-sign given by the sacred chickens, at its strongest when grain fell from the beak as the birds fed.
- lituus
- The augur's crook-topped staff, used to mark out the field of observation and the college's standard emblem in art and on coins.
Contested points
How far, and how often, could an augur as against a magistrate actually stop public business by announcing a sign?
One line, associated with the detailed reconstruction of augural law by Jerzy Linderski, works from the distinction Cicero draws as an augur at Philippics 2.81, where he says that the augurs have only nuntiatio while the consuls and the other magistrates have spectio as well: augurs hold the right to announce an intervening unsought sign, while magistrates hold in addition the right to watch for signs. On this reading both are operative powers rather than expert commentary after the fact, and the live question is a narrower one — how often, and under what constraints, an augur's nuntiatio was actually exercised, given that the reported cases of business being stopped are overwhelmingly cases of magistrates announcing. Another reading presses Cicero's statutory language in De legibus 2.21, that whatever an augur has declared faulty or ill-omened is to be void, harder, and allows augurs a broad and directly obstructive power over public business in their own right. The dispute matters because it decides whether augury was a priestly veto over politics or a technical competence at politicians' disposal, and it cannot be settled because the augural books are lost and the surviving cases are reported by interested parties.
Does the frequency of obnuntiatio in the 50s BC show the procedure being used instrumentally, or only that our sources for those years are political ones?
One reading takes the run of reported announcements in that decade — Bibulus watching the sky against Caesar's legislation in 59, a Clodian law of 58 generally understood to have restricted announcement, and the repeated obstructions around contested bills thereafter — as evidence that the procedure was by then being applied as a scheduling device, more often and more mechanically than the augural law envisaged. The other observes that the narrative record for those years is almost wholly political — Cicero's speeches and letters, and later historians working from them — so that announcements attached to disputed legislation are exactly the ones that would be preserved, while consultations that produced a favourable sign and no dispute leave no trace at all. No comparably documented earlier decade survives against which the frequency could be measured, so the apparent spike cannot be separated from the shape of the evidence. The wider argument about what this implies for late-Republican religion as a whole belongs to the record on Roman state religion rather than here.
Where this comes from
Cicero, De divinatione book 2, ch. 33 (approximately §§ 71-74)
In the sceptical second book the speaker attacks the chicken-auspices, pointing out that a hungry bird will feed and a fed one will not, and citing the notorious case of a commander at Drepana who defied the birds; the passage is arguing that the sign is manipulable, which incidentally confirms how the procedure was conducted.
Cicero, De legibus book 2, around §§ 20-21 (the law code), with discussion following
Sets out, in the form of a proposed statute, that acts an augur declares faulty or ill-omened are to be void, and that the augurs hold authority over the observation of signs for public business.
Cicero, Philippics 2.81
Cicero, himself a member of the college, states the division of augural competence: the augurs have only the right to announce a sign, while the consuls and the other magistrates have in addition the right to watch for one. The remark is made while attacking Antony's conduct as augur at the election of Dolabella in 44 BC, and it is the sentence from which modern reconstructions of the spectio/nuntiatio distinction are built.
Varro, De lingua Latina book 7, around §§ 8-9
Explains the word templum as a space delimited by formulaic speech for the purpose of augury, and reproduces wording used to fix the boundaries of the templum on the citadel.
Livy, Ab urbe condita book 10, ch. 40
Narrates a consul before battle being given a false report of a favourable tripudium by the chicken-keepers; when the deception is exposed, the consul rules that the fault and its consequences fall on the man who made the false report, and proceeds.
Cicero, correspondence (Letters to Atticus)
Contemporary references to Bibulus obstructing Caesar's legislation in 59 BC by announcing that he was watching the sky — the nearest thing we have to real-time evidence of obnuntiatio in political use.
Covered elsewhere
- The Roman imperial cult. The theme argues the imperial cult end to end — worship of the living emperor in the provinces, formal deification after death, and the Christian refusal read as disloyalty. /civilizations/principate repeats it. A fourth account would split one query.
- Roman state religion as a political system — priestly colleges as public magistracies, pax deorum. The theme argues the whole Roman arc from Republican augurs to Christian emperors as one continuous project. This layer takes the procedures, never the political argument about them.
- Temple architecture — plan, cella, peristyle, entasis, polychromy. The record owns the fabric and its four building examples, and stops deliberately at the altar. This layer takes the rite at that altar and leaves the building where it is.
How to read the evidence labels
- Evidence level: Documented
- Supported by a named primary text or by excavated material evidence.
- Evidence level: Probable
- Supported by strong inference that most specialists accept.
- Evidence level: Disputed
- Substantial specialist disagreement exists; competing readings are stated.
- Evidence level: Literary
- Belongs to poetic or mythological construction rather than to history.
- Evidence level: Mythological
- Belongs to shared religious or mythic tradition rather than to any single text.
- Evidence level: Unknown
- The available evidence is insufficient to decide.
These labels describe the status of the evidence, not our confidence in a conclusion. A claim marked Literary is not a claim we doubt; it is a claim about what kind of thing a poem is.