Frontinus

• 1. Introduction

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  Frontinus received the surrender of 70,000 Lingones in AD 70. That single figure, recorded in his own hand, captures something essential about Sextus Julius Frontinus: a man who lived at the center of Roman military and administrative power, yet chose to spend his later years writing technical reports about pipes. He was a general, a three-time consul, and a senator who rose from the equestrian class to the highest circles of the Roman state. But what earned him a place in history was a two-volume official report on the water supply of Rome. Who was this man who fought wars on the Rhine, governed Britain, and then turned his attention to the problem of lead pipe theft? And what does his writing tell us about how Rome actually worked?

• 2. A Life Without a Stone

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  No tombstone survives for Frontinus. No honorific inscription in his hometown names his parents or his wife. Scholars believe he came from Narbonese origins and entered public life from the equestrian class, making him what the Romans called a novus homo: a new man, without senatorial ancestors. The nomenclature of Publius Calvisius Ruso Julius Frontinus, who held the consulship around AD 84, suggests Frontinus had a sister who was that man's mother. His daughter married Quintus Sosius Senecio, who held the consulship in 99 and again in 107, and she became the mother of Sosia Polla. These scattered name connections are nearly all that survive of his family life. The date of his death, 103 or 104, is known only because the younger Pliny wrote to friends that he had been elected to the College of Augurs to fill the vacancy Frontinus left behind.

• 3. Soldier and Governor

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  By AD 70, Frontinus was fighting in the Rhineland, helping suppress a revolt serious enough that tens of thousands surrendered to him personally. Between that campaign and his appointment as governor of Britain, he held the office of suffect consul. In Britain, he subdued the Silures of South Wales and is thought to have also campaigned against the Brigantes in the north. When Gnaeus Julius Agricola, the father-in-law of the historian Tacitus, succeeded him in 77, Frontinus left behind a province more firmly under Roman control than he had found it. Birley, the scholar who has studied his career closely, believes it is fair to speculate that Frontinus was alongside Domitian during the German campaign of 83. An inscription at Hieropolis in Phrygia, and a set of coins from Smyrna, confirm he served as proconsul of Asia in AD 86.

• 4. Trajan's Debt

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  In 97, the emperor Nerva appointed Frontinus curator aquarum, supervisor of the aqueducts of Rome. The office was reserved for men of very high standing, and Frontinus was following in the footsteps of Agrippa, the friend and son-in-law of Augustus, who had organized a major campaign of public repairs in 34 BC. The following year, Frontinus held a second consulship as suffect in February, with Trajan as his colleague. Two years after that, he was made consul ordinarius alongside Trajan again. Birley notes that this exceptional honour underlines the high regard in which Frontinus was held, and suggests, further, that Trajan had a debt to repay. He was also a member of the College of Augurs. Few Romans outside the imperial family accumulated this degree of trust across successive emperors.

• 5. The Aqueduct Report

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  De aquaeductu is, on its surface, an official report to the emperor on the state of Rome's water supply. In two books, it covers the history, dimensions, and discharge rates of all nine aqueducts operating at the turn of the first century AD: the Aqua Marcia, Aqua Appia, Aqua Alsietina, Aqua Tepula, Anio Vetus, Anio Novus, Aqua Virgo, Aqua Claudia, and Aqua Augusta. Frontinus describes the quality of water delivered by each aqueduct, which depended on whether the source was a river, a lake, or a spring. He details the laws governing use and maintenance. The distribution logic he describes was complex: poor-quality water went to irrigation, gardens, or flushing; the best water was reserved for drinking; intermediate-quality water supplied the many baths and fountains. One of his first decisions as curator was to stop the practice of mixing water from different sources, which he criticized directly. The standard modern edition of the Latin text, with extensive English commentary, was published by R. H. Rodgers through Cambridge University Press in 2004.

• 6. The Problem of Stolen Water

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  Before Frontinus could repair anything, he needed to know what he was dealing with. His first task was to commission maps of the entire aqueduct system. What the maps revealed was a network that had been neglected and was not operating at full capacity. The cause was not only decay. Unscrupulous farmers, tradesmen, and others had been inserting pipes directly into the aqueduct channels to siphon off supply. Frontinus responded with a meticulous survey of intake and output for each line, then investigated every discrepancy he found. Lead pipe stamps bearing the owner's name were introduced as a tool to prevent further theft. He was also alert to leaks, especially those in underground conduits, which were difficult to locate and difficult to mend. He acknowledged that the problem of hidden leaks in buried pipes was not one he could fully solve. He noted that trees had to be kept at a distance from above-ground structures so their roots would not damage the masonry. He was familiar with the work of Vitruvius, whose De architectura, published the previous century, addressed aqueduct construction; Frontinus himself refers to the possible influence of Vitruvius on the plumbers he oversaw.

• 7. The Military Writer

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  Frontinus also wrote a theoretical work on military science, but that text has not survived. What has survived is the Strategemata, a Latin collection of military stratagems drawn from Greek and Roman history, intended for the practical use of generals. He drew on his own experience commanding forces under Domitian in Germania, but the text also shows clear parallels with earlier Roman writers, including Valerius Maximus and Livy, suggesting he relied heavily on literary sources. One example he preserved involves a commander named Lucius Metellus, fighting in Hither Spain, who diverted a river from higher ground and flooded an enemy camp located in a valley. When panic set in, soldiers Metellus had stationed in ambush moved in for the kill. The authenticity of the fourth book of the Strategemata has been questioned by scholars. A translation by Charles E. Bennett, edited by Mary B. McElwain, appeared in the Loeb Classical Library in 1925.

• 8. Afterlife in Fiction

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  Frontinus surfaces as a fictional character in several novels set in ancient Rome. He appears in four of the Marcus Didius Falco novels: The Silver Pigs, Shadows in Bronze, Three Hands in the Fountain, and The Jupiter Myth. He also appears in two novels from The Centurions series, Barbarian Princess and The Emperor's Games. His actual writings remain accessible in multiple forms. Rodgers published his English translation of De aquaeductu online; a translation by Herschel is valued specifically for its commentary on the engineering aspects of the text. Extracts of a land surveying treatise attributed to Frontinus appear in B. Campbell's 2000 volume, The Writings of the Roman Land Surveyors. The Strategemata and The Aqueducts of Rome, translated by Charles E. Bennett, are also available as an audiobook through Librivox, carrying the voice of a two-time consul and three-time governor across a medium Frontinus could not have imagined.