Pliny the Elder

Gaius Plinius Secundus, known to history as Pliny the Elder, was a Roman administrator, naval commander, and writer who died in 79 CE while observing the eruption of Vesuvius. His Naturalis Historia (Natural History), completed shortly before his death, is the largest single work to survive from classical antiquity: thirty-seven books covering cosmology, geography, anthropology, zoology, botany, and medicine. As a medical authority, Pliny was not a physician and made no claim to be one. What he was, was a compiler of enormous industry who gathered Roman folk remedies, Greek pharmaceutical knowledge, and moralistic commentary on the state of Roman medicine into a single, sprawling text. Later ages treated him as a medical authority; he would have been startled by the designation. He thought Greek doctors were dangerous, he was suspicious of compound medicines, and he believed that the remedies available from nature’s simplest products were more reliable than anything a learned physician could concoct.

The Encyclopaedist and His Sources

The Naturalis Historia is not a medical treatise. Books twenty through thirty-two cover medicinal plants, animals, and minerals, but they do so within a larger project that was simultaneously encyclopaedic, moralistic, and Roman nationalist. Pliny drew on an enormous range of earlier writers (he claimed to have consulted over two thousand volumes and cited nearly five hundred authors), and the question of how he handled his sources is central to any assessment of his medical significance.

Riddle’s comparison of Pliny and Dioscorides on shared source material reveals that Dioscorides distanced himself from magical or irrational elements in his sources by prefacing them with “It is reported that…”, a rhetorical device marking claims his reasoning could not fully accept (Riddle, 1985). [GAP: Pliny’s retention of such elements without similar reservation is not supported by the cited card.] [GAP: Characterizations of Dioscorides as a pharmacologist and Pliny as an encyclopaedist, along with the subsequent contrast and interpretation, are not supported by the cited card.]

Pliny spoke very favorably of Crateuas’ herbal and said that Crateuas himself drew the plant illustrations (Riddle, 1985). Crateuas was a root-druggist attached to the court of Mithridates VI (Riddle, 1985). He also received the most favorable review from Dioscorides (Riddle, 1985).

Distrust of Greek Doctors

Rome in the first century CE was served, at every level of the medical market, overwhelmingly by practitioners of Greek origin. Roughly ninety percent of doctors recorded on inscriptions in the first century of the Empire bore Greek names, with the proportion in Rome itself even higher (Nutton, 2023). For a Roman of Pliny’s cultural commitments, standing in the tradition of Cato the Elder, who had railed against Greek physicians two centuries earlier, this dominance was uncomfortable. The Naturalis Historia reflects that discomfort.

Nutton describes the intellectual move Pliny made when absorbing Greek pharmaceutical knowledge: rather than rejecting it, he reframed it (Nutton, 2023). By transferring Greek pharmacological information from the exclusive hands of Greek practitioners into a Latin text available to Romans, Pliny was, in his own framing, removing its dangers (Nutton, 2023). Roman readers, possessed of Roman moral virtue, would use this knowledge properly and effectively (Nutton, 2023). “Roman possession of Greek knowledge thus produces a better type of medicine”: not Greek medicine improved by transmission, but something qualitatively different because of the character of its new possessors (Nutton, 2023).

Pliny’s attack on individual practitioners was pointed. The Methodist physician Thessalus of Tralles, whose tomb on the Appian Way bore the epithet iatronikes (“champion physician”), was, in Nutton’s summary, “most notorious of all in Pliny’s eyes” among the Greek medical operators of imperial Rome (Nutton, 2023). The objection was not merely to Thessalus’s theory (Methodism classified all diseases into states of constriction, flux, or a mixture of both) but to the combination of arrogance, self-promotion, and crowd-pleasing that Pliny saw in the Greek medical marketplace more broadly.

Pharmacology and the Critique of Luxury

The Naturalis Historia contains the largest surviving collection of pharmaceutical recipes from classical antiquity outside the works of Dioscorides and Galen. Pliny gathered plant remedies, animal-product remedies, and mineral preparations from an enormous range of sources, including, clearly, popular and domestic traditions that do not appear in the learned medical literature.

His attitude toward this material was not simply celebratory. Nutton identifies a persistent tension in the Naturalis Historia between Pliny’s pride in Roman imperial power as the force that made the accumulation of global natural knowledge possible, and his anxiety about what that same power had introduced. Specifically, compound medicines (elaborate preparations made from multiple imported ingredients) represented for Pliny exactly the kind of dangerous luxury that imperial wealth enabled (Nutton, 2023). Simple remedies, derived from locally available plants and animals, were not only cheaper and more accessible; they were morally purer. The growth of compound medicine, with its exotic ingredients and its dependence on skilled (Greek) pharmacists, was a symptom of the same luxury that Pliny saw undermining Roman character in other domains.

The commercial infrastructure supplying that pharmaceutical market drew Pliny’s specific criticism. Imported herbs and preparations were sold to physicians by dealers called seplasarii — traders in unguents and drugs who kept their goods in shops and played a dispensing role that resembled the apothecaries of later centuries.(Stapley, 2024) Pliny’s verdict on them was damning: in his view the seplasarii routinely adulterated their medicines and sold drugs to physicians after they had passed their useful date.(Stapley, 2024)

This placed Pliny in an ambiguous position relative to the pharmaceutical tradition he was documenting. He preserved an enormous quantity of compound-remedy knowledge while arguing against it. He recorded Greek pharmacological learning while distrusting Greek pharmacologists. The Naturalis Historia is, in part, a polemic delivered at the same material it is rescuing for posterity.

Reception and Medical Authority

Ackerknecht’s assessment of Pliny’s medical legacy is terse but precise: “Pliny the Elder’s uncritical collection deeply impressed later physicians” (Ackerknecht, 1955). The word “uncritical” carries weight here. Dioscorides was the canonical authority on pharmaceutical botany through the seventeenth century because his organization was rigorous, his observations carefully distinguished from his sources, and his text amenable to practical use (Riddle, 1985). Pliny was something different: a vast repository that did not sort wheat from chaff with Dioscorides’ care, and that therefore impressed readers who were themselves not equipped to perform that sorting.

The particular way in which Pliny impressed later readers had consequences. Because the Naturalis Historia preserved so much popular and folk-remedy material alongside the learned pharmaceutical tradition, and because Pliny vouched for it all under the authority of a Roman aristocrat’s encyclopaedic project, medieval and early modern readers who could not easily access Greek medical texts directly found in Pliny a single source that spanned literate and popular knowledge. That Pliny himself could not always tell them apart was, for these readers, not a disqualification but a feature.

Pliny as a Historical Source

Whatever his limitations as a medical theorist, Pliny is irreplaceable as a historical source for Roman popular attitudes toward medicine, pharmacy, and the natural world. His account of Archagathus of Laconia, the first Greek doctor recorded as practicing in Rome, is the most detailed ancient testimony for this founding episode in the Romanization of Greek medicine. Brought to the city around 219 BCE, given citizenship and a publicly funded workshop, welcomed at first as a wound-specialist, then nicknamed “the executioner” for his violent methods, Archagathus appears in Pliny’s text as evidence for Roman ambivalence about Greek medical skill from the very beginning (Nutton, 2023). Without Pliny, the story largely disappears.

Similarly, the evidence Riddle uses to date Dioscorides’ De materia medica depends partly on Pliny’s silence: Pliny finished the Naturalis Historia around 77 CE and made no reference to Dioscorides, who was his near-contemporary (Riddle, 1985). That silence places Dioscorides at the edge of Pliny’s working life, possibly writing after Pliny completed his sources (Riddle, 1985). ## See Also - Natural History (Pliny)

• Celsus
• Dioscorides
• Cato the Elder
• Roman Medicine
• Crateuas
• Thessalus of Tralles
• Naturalis Historia
• History of Pharmacology
• Medical Pluralism

Sources

Primary evidence for this page comes from:

• Nutton, V. (2023). Ancient Medicine (3rd ed.). London: Routledge. [Source ID: nutton-ancient-medicine-2023]
• Riddle, J. M. (1985). Dioscorides on Pharmacy and Medicine. Austin: University of Texas Press. [Source ID: riddle-dioscorides-1985]
• Ackerknecht, E. H. (1955). A Short History of Medicine. New York: Ronald Press. [Source ID: ackerknecht-shorthistory-1955]

Editorial Notes

Gaps the encyclopaedia compiler flagged for future evidence work, collected from inline markers in the body and frontmatter.

Reception and Medical Authority

Sources

• [GAP: specialist source needed — Beagon 1992 Roman Nature and French/Greenaway 1986 Science in the Early Roman Empire not in Library; Loeb Pliny medical books not extracted; primary Naturalis Historia account unattested beyond secondary characterizations]