The Timpson Lyceum · History of Rome – Titus Livius (2025)

Servius Tullius, Sixth King of Rome – Lecture 7 (History of Rome)

Overview

Servius Tullius, the sixth king of Rome (traditionally 578–535 BC) and the second of the three Etruscan kings, is remembered less for his wars than for a sweeping reorganization of the Roman state. Raised in the household of his predecessor Tarquinius Priscus and installed on the throne through the maneuvering of the queen Tanaquil rather than by regular election, he spent his reign trying to secure a legitimacy he had never fully possessed — and in the process rebuilt how Romans were counted, taxed, armed, and voted.

His signature achievements — the census, the wealth-based centuriate organization, the Servian Wall, and the enlargement of the city's sacred boundary — outlasted the monarchy by centuries. The comitia centuriata he created remained Rome's most important voting body throughout the Republic. Yet the same reforms that endeared him to the common people alienated the patrician aristocracy, and his reign ended in one of the most notorious episodes in Roman tradition: his murder, engineered by his own daughter Tullia and her husband Lucius Tarquinius, and Tullia's chariot driven over her father's corpse in a street thereafter called the Vicus Sceleratus.

Key Concepts

• Servius Tullius — Sixth king of Rome (reigned c. 578–535 BC, traditionally 44 years). Of debated origin (Latin or Etruscan), he was reared in the royal household and named heir over the sons of Tarquinius Priscus at the urging of the queen Tanaquil. Counted among the three "Etruscan kings."
• Accession without election — The sons of Ancus Marcius had assassinated Tarquinius Priscus; Servius, warned by this, took power through the queen's contrivance rather than a Senate-then-assembly vote. The irregularity dogged him for life and became the aristocracy's chief grievance.
• Dynastic marriages — To neutralize the two sons of Tarquinius, Servius married them to his two daughters (both named Tullia), hoping to fold the rival line into his own bloodline. The strategy backfired disastrously.
• Wars against Veii — The great Etruscan city of Veii, Rome's foremost neighbor-rival until Carthage, was the target of successful campaigns celebrated with three triumphs. The victories extended Roman control across the Tiber into the fringe of Etruria.
• The census — Servius' most consequential innovation: a periodic registration of every citizen's name and the assessed value of his property, measured in asses (the bronze weight-unit of the day). The census fixed each man's military obligation, tax (tributum) liability, and voting weight simultaneously.
• Wealth classes — Citizens were sorted by property into the cavalry (equites, over 100,000 asses), five infantry classes (I: 100,000; II: 75,000; III: 50,000; IV: 25,000; V: 11,000 asses), and the property-less proletarii (or capite censi) below the fifth threshold.
• The century (centuria) — The organizing unit, nominally 100 men, serving jointly as a military draft-block and a voting-block. Servius created 193 centuries in total.
• The comitia centuriata — The centuriate assembly, in which each century cast one bloc vote. Because the wealthy filled far more centuries than their numbers warranted, this body was structurally weighted toward the rich — the mechanism worked out in the example below.
• Citizen-soldier principle — Military service and the franchise were one and the same: those who fought (and equipped themselves) voted, and the more a man contributed, the heavier his vote. "He who defends the state rules it."
• The four urban tribes — Servius also redivided the city's population geographically into four urban tribes (Suburana, Esquilina, Collina, Palatina), replacing the older kin-based curiae as the basis of registration.
• The Servian Wall — A massive fortification (large ashlar blocks, roughly 3.6 m thick and up to ~10 m tall in places) traditionally credited to Servius, enclosing the Septimontium, the city of the seven hills. Sections and gates survive today.
• The pomerium — Rome's sacred legal boundary, which Servius extended to coincide with the new wall, so that the wall marked both the military and the religious/legal edge of the city.
• Land distribution — Servius parceled conquered land (especially north of the Tiber) directly to the common people without consulting the Senate — popular with the plebs, an outrage to the patricians.
• Tullia and the murder — His ambitious younger daughter Tullia and Tarquinius Priscus' son Lucius each killed their spouses, married, and conspired against Servius. Lucius seized the throne physically, hurled the aged king down the Senate steps, and had assassins finish him. Tullia then drove her chariot over her father's body, giving the Vicus Sceleratus ("Street of Crime") its name.

Worked Example

The weighted vote of the comitia centuriata. The genius — and the bias — of Servius' system lay in how 193 voting-blocs were distributed. Reconstruct the tally and measure exactly how much of the vote the wealthiest citizens controlled.

1. Total the centuries. The Servian scheme allotted:

$18 \;(\text{equites}) + 80 \;(\text{class I}) + 20 + 20 + 20 \;(\text{classes II–IV}) + 30 \;(\text{class V}) + 4 \;(\text{engineers} + \text{musicians}) + 1 \;(\text{proletarii}) = 193.$

1. Fix the majority threshold. With $193$ centuries voting, a majority requires more than half:

$\frac{193}{2} = 96.5 \quad\Longrightarrow\quad \text{a majority} = 97 \text{ centuries}.$

1. Count the top of the pyramid. The 18 equestrian centuries and the 80 centuries of the first class together give

$18 + 80 = 98.$

1. Compare to the threshold. Since $98 > 96.5$, the wealthiest citizens already command an outright majority:

$98 > 97 \quad\Longrightarrow\quad \text{issue decided.}$

1. Compute their share of the vote. The fraction of all centuries controlled by the equites plus class I is

$\frac{98}{193} \approx 0.508 = 50.8\%.$

1. Note the leverage. Voting proceeded from richest to poorest and stopped the moment a majority was reached. If the equites and first class agreed, the roughly $95$ remaining centuries — classes II through V and the proletarii, i.e. the overwhelming bulk of the population — were never even called. A tiny, property-heavy minority of citizens thus decided outcomes while formally preserving universal participation. $\blacksquare$

Summary

• Servius Tullius (c. 578–535 BC), sixth king, reached the throne irregularly through the queen's intrigue, and spent his reign shoring up a legitimacy he lacked.
• His census tied together taxation, military duty, and voting, sorting citizens by property (in asses) into the equites, five classes, and the proletarii.
• The comitia centuriata he created — 193 centuries — remained the Republic's premier voting body; its structure let the top classes ($18 + 80 = 98$ centuries, about $50.8\%$) decide most questions before the poor voted.
• He built the Servian Wall around the seven hills, extended the pomerium to match it, defeated Veii in three triumphs, and gave conquered land to the people over the Senate's objection.
• His popularity with the plebs and hostility from the patricians ended in murder by Tullia and Lucius Tarquinius — the Vicus Sceleratus — clearing the way for the tyranny of Tarquinius Superbus.