Roman rhetorical theory often distinguishes a plain, middle, and grand manner of expression. These are not three grammars or fixed word lists. They are coordinated choices about syntax, vocabulary, figures, rhythm, delivery, subject, and audience. A skilled speaker can move among them within one speech: clarity for facts, polish for praise, and grandeur for a peroration.
The anonymous Rhetorica ad Herennium 4.11 gives a compact source-faithful statement: “Sunt igitur tria genera, quae genera nos figuras appellamus, in quibus omnis oratio non vitiosa consumitur: unam gravem, alteram mediocrem, tertiam attenuatam vocamus.” It calls the styles gravis, mediocris, and attenuata. “Grand,” “middle,” and “plain” are useful English equivalents, not timeless technical terms with perfectly identical definitions in every ancient author. Cicero and Quintilian adapt the tripartition to their own arguments; Ciceronian Oratorical Prose shows how one author varies the resources in practice.
A diagnostic, not three boxes
The best first question is not “Does this sentence contain a rare word?” but “What is the passage trying to make its audience do?” Roman discussion connects style with rhetorical task and decorum—fitness to matter, speaker, audience, and moment.
| Style | Typical discourse goal | Characteristic resources | Characteristic failure |
|---|---|---|---|
| attenuāta, plain | explain, narrate, prove, converse | familiar vocabulary, transparent clause relations, restrained rhythm and figures | exīlis: meagre, lifeless, underdeveloped |
| mediocris, middle | please, sustain attention, recommend | balanced phrasing, selective metaphor, smoother rhythm, moderate amplification | dissolūta or drifting: slack, unshaped, without control |
| gravis, grand | move, arouse, magnify, condemn | periods or abrupt climaxes, apostrophe, anaphora, weighty diction, marked cadence | sufflāta: inflated, bombastic, disproportionate |
The failure terms summarize the Ad Herennium’s warning that each acceptable type has a nearby vice. The important distinction is functional. Plain style is not careless conversation; grand style is not maximum ornament in every clause.
The plain style: transparent but crafted
The plain style (formal explanatory or forensic) aims to make the proposition and its support readily recoverable. It favors common vocabulary, explicit logical links, and syntax whose hierarchy can be heard without prolonged suspense. That does not mean every sentence is short or every verb is placed in English order.
Testis adfuit et haec verba audīvit.
The witness was present and heard these words.
Quia tabulae inter sē congruunt, haec ratiō testimōniīs cōnfirmātur.
Because the records agree with one another, this account is supported by the evidence.
The causal quia makes the inference explicit. Vocabulary is ordinary and concrete. The sentence can still perform serious legal work without apostrophe or climax.
Plain narrative likewise prioritizes event sequence:
Prīmā lūce legātī vēnērunt; merīdiē senātus eōs audīvit.
At dawn the envoys arrived; at midday the senate heard them.
This is (plain historical/administrative) style. Time expressions and parallel perfects organize the account. Calling it “plain” does not claim that every historian narrates this way; Sallustian compression and Livian periodicity are different cultivated norms.
The middle style: polish and sustained engagement
The middle style (formal epideictic or persuasive) often develops a thought through balance, moderate imagery, and a rhythm smooth enough to please without demanding the emotional pressure of a peroration.
Hic vir nōn modo cīvitātī prōfuit, sed etiam iuventūtī exemplum virtūtis relīquit.
This man not only benefited the community but also left the young an example of excellence.
The correlative nōn modo … sed etiam and balanced objects shape praise. The vocabulary remains intelligible; the style’s polish comes from arrangement and measured enlargement.
Ut arbor bona frūctūs fert, ita cōnsilium sapiēns diū cīvitātem alit.
As a good tree bears fruit, so a wise policy nourishes a community for a long time.
The simile and ut … ita frame are (middle epideictic) rather than automatically poetic. A single controlled image can illuminate an argument; a chain of mismatched images would become a fault.
Sociōs fidē retinuit, adversāriōs clementiā placāvit, omnēs aequitāte sibi conciliāvit.
He kept allies through loyalty, appeased opponents through clemency, and won everyone over through fairness.
Three parallel ablatives and verbs produce a polished tricolon. Its emotional temperature is approving but not explosive.
The grand style: weight proportionate to the moment
Grand style (high oratorical/literary) seeks to move an audience. It can use long periods, but it can also become grand through abrupt questions, exclamations, and fragments. Grandeur therefore cannot be reduced to sentence length.
Ō cīvēs, sī hanc iniūriam tacitī ferēmus, nōn modo dignitātem nostram, sed ipsam lībertātem āmittēmus.
Citizens, if we silently endure this wrong, we shall lose not only our dignity but freedom itself.
Vocative address, the condition, and the progression from dignitātem to ipsam lībertātem suit a (grand deliberative) appeal. The vocabulary is not obscure; scale and arrangement create the force.
Quis hoc ferat? Quis taceat? Quis līber esse velit et servitūtem nōn recūset?
Who could endure this? Who could keep silent? Who could wish to be free and not reject slavery?
The potential subjunctives and anaphoric quis create an abrupt grand climax. Compare a calmer plain version:
Haec condiciō accipienda nōn est, quod lībertātem minuit.
This condition must not be accepted, because it diminishes freedom.
Both sentences can argue the same proposition. The first publicly activates indignation; the second explicitly states a reason. That minimal functional contrast matters more than counting words.
One proposition in three styles
The following teaching models report a broken bridge and recommend delay. They are not quotations from ancient authors.
Pōns ruptus est; exercitus trānsīre nōn potest.
The bridge has collapsed; the army cannot cross. (plain)
Ponte subitō ruptō, iter quod tūtum putāverāmus exercituī clausum est.
With the bridge suddenly broken, the route we had thought safe is closed to the army. (middle)
Quō nunc, mīlitēs, ruāmus, cum ipse pōns, speī nostrae iter, violentā flūminis vī ceciderit?
Where are we now to rush, soldiers, when the bridge itself—the path of our hope—has fallen before the river's violent force? (grand)
The plain version coordinates two facts. The middle version uses an ablative absolute and relative clause to relate expectation to reversal. The grand version turns to the soldiers, uses a deliberative question and a metaphorical apposition, and delays the explanation. None is universally “best.” An engineer’s report, a historical narrative, and a battlefield appeal require different choices.
Morphology, syntax, vocabulary, and rhythm
No tense, mood, or case belongs exclusively to one style. Grand passages may concentrate vocatives, deliberative or potential subjunctives, superlatives, and imperatives because their discourse goals involve address and pressure. Plain proof may concentrate indicatives, causal clauses, and concrete agents because it establishes facts. Those are tendencies produced by purpose, not morphological definitions.
Similarly, familiar vocabulary can become grand through position and repetition, while a rare archaism can remain merely distracting. Prose rhythm matters across all three styles: plain prose still avoids accidental harshness; middle prose often displays balanced cola; grand prose can close an argument with a strongly marked cadence. These are quantitative Classical rhythms, not the accentual cursus of later medieval prose.
Rēs clāra est; testēs enim inter sē cōnsentiunt.
The matter is clear, for the witnesses agree with one another. (plain argumentative)
Testēs, locō ortūque diversī, ūnā tamen vōce cōnsentiunt.
The witnesses, diverse in place and origin, nevertheless agree with one voice. (middle argumentative)
The second version has antithesis and metaphorical ūnā vōce, but does not demand grand emotional delivery.
Shifting style within a speech
Ancient theory does not require a speech to remain at one level. A narrātiō can be comparatively plain so the facts seem credible; a praise section can adopt middle polish; a perorātiō can rise into grand appeal. A sudden plain sentence after amplification may itself be devastating because restraint signals confidence.
English-speaking learners often compose grand Latin by substituting long Latinate abstractions and postponing every verb. Classical Latin more often derives weight from concrete agency, antithesis, controlled subordination, and sound. Cōnsul urbem servāvit can carry more force than an obscure pile of genitives.
Common Mistakes
1. Equating plain style with faulty or childish Latin.
❌ Stilus extenuātus coniunctionēs et ratiōnem neglegit.
Incorrect claim: plain style does not neglect conjunctions or reasoning.
✅ Stilus extenuātus rem clārē et aptē expōnit.
Plain style explains the matter clearly and appropriately.
2. Making grand style by adding indiscriminate superlatives.
❌ Ō maximī optimī splendidissimī cīvēs, minimam hanc tabulam aspicite!
Caricatured: maximum praise is disproportionate to asking citizens to inspect a tiny notice.
✅ Cīvēs, hanc tabulam aspicite; lēx nova hīc scrīpta est.
Citizens, inspect this notice; a new law is written here.
3. Assuming one subject permanently determines one level.
❌ Dē bellō semper granditer, dē testibus semper extenuātē dīcendum est.
Incorrect: subject alone does not mechanically determine style.
✅ Stilus ad causam, locum, audītōrēs atque cōnsilium accommodandus est.
Style must be adapted to the case, occasion, audience, and purpose.
4. Treating every long period as grand.
❌ Hanc sententiam, quod longa est, gravem esse necesse est.
Incorrect claim: a sentence is not necessarily grand because it is long.
✅ Sententia gravis est sī pondus reī verbīs, figūrīs numerīsque convenientibus auget.
A sentence is grand if it magnifies the weight of the matter with fitting words, figures, and rhythms.
Key Takeaways
Plain, middle, and grand are functional profiles. Plain style clarifies without becoming meagre; middle style pleases without drifting; grand style moves without inflation. Diagnose purpose, then examine the cluster of syntax, diction, figures, rhythm, and delivery that serves it. The highest achievement is not permanent grandeur but appropriate variation.
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