Servian constitution
The Servian constitution is the military and political organization of ancient Rome attributed by Roman tradition to the semi-legendary sixth king of Rome, Servius Tullius. Most of the Servian reforms extended voting rights to certain groups, in particular to Rome's citizen-commoners who were minor landholders or landless citizens hitherto disqualified from voting by ancestry, status or ethnicity—collectively, the plebs as distinguished from the hereditary patricians. These reforms thus redefined the fiscal and military obligations of all Roman citizens. The so-called Servian constitution probably represents a long-drawn, complex and piecemeal process extending from Servius' predecessors, Ancus Marcius and Tarquinius Priscus, to his successor Tarquinius Superbus, and into the Middle and Late Republic. Rome's military and territorial expansion and the consequent changes in its population made franchise regulation and reform an ongoing necessity. The wholesale attribution of these measures to Servius "cannot be taken at face value".
The Servian constitution introduced two elements into the Roman system of government: a census of every male citizen, to establish his wealth, tax liabilities, military obligation, and the weight of his vote; and the comitia centuriata, an assembly with electoral, legislative and judicial powers. Both institutions are foundational for Roman republicanism. By entrusting the military defense of the state to all citizens, the Servian reform created interdependency among the social classes; in its organization of voting tribes, it inextricably allied political and military life and opened up a "political space" for republican participation. To the Augustan historian Livy, the military service rendered by plebeians was thus a form of public service on a par with patrician duty in the Senate. Even so, census rank depended on property value, and under the Servian constitution no citizen assessed at a worth of less than 11,000 asses was admitted to the regular army.
Curiate reform and census
Until the Servian reforms, the passing of laws and judgment was the prerogative of the comitia curiata, made up from thirty curiae; Roman sources describe ten curiae for each of the three aristocratic tribes, the Ramnes, the Tities, and the Luceres, each claiming patrician status and privilege to election as magistrates by virtue of their descent from Rome's founding families. These tribes, supposedly based on three of Rome's hills, comprised approximately 200 gentes, each of which contributed one senator to the Senate. The senate advised the king, devised laws in his name, and was held to represent the entire populus Romanus ; but it could only debate and discuss. Its decisions had no force unless approved by the comitia curiata. By the time of Servius, if not long before, the tribes of the comitia were a minority of the population. Rome's far more populous citizen-commoners could participate in this assembly in limited fashion, and perhaps offer their opinions on decisions but only the comitia curiata could vote. An aristocratic minority thus exercised power and control over the commoner majority.Roman tradition held that Servius formed a comitia centuriata of commoners, elected by the citizens as a whole, to augment or displace the comitia curiata as Rome's central legislative body. This required his development of the first Roman census, making Servius the first Roman censor. The census was organised on military lines; citizens assembled by tribe in the Campus Martius, to register their social rank, household, property and income. This established an individual's tax obligations; his capacity to muster arms at his own expense, when required to do so by the citizen's obligation to give military service; and his assignment to a particular voting bloc in elections and law-making.
The institution of the census and the comitia centuriata are speculated as Servius' attempt to erode the civil and military power of the Roman aristocracy, and seek the direct support of his newly enfranchised citizenry in civil matters; if necessary, under arms. The comitia curiata continued to function through the Regal and Republican eras, but the Servian reform had reduced its powers to those of a largely symbolic "upper house" whose noble members were expected to do no more than ratify decisions of the comitia centuriata.
Classes and army
The census classified Rome's male citizen population according to status, wealth and age. The classes were subdivided into groups called centuriae, nominally of 100 men but in practice of variable number, further divided into seniores and iuniores. Adult male citizens were obliged, when called upon, to fulfill military service according to their means, which was supposedly assessed by as, a monetary unit that in the archaic period represented a particular weight of bronze or copper. This evaluated wealth of a citizen was based primarily on land ownership and head of livestock until the introduction of a monetary system in the 2nd century BC. A citizen's wealth and class would therefore have defined their position in the civil hierarchies, and up to a point, within the military; but despite its apparent military character, and its possible origins as the mustering of the citizenry-at-arms, the system would have primarily served to determine the voting qualifications and wealth of individual citizens for taxation purposes, and the weight of their vote. Wars were occasional but taxation was a constant necessity; and the comitia centuriata met whenever required to do so, in peace or war. In effect, the comitia centuriata was the representative assembly, in a civil and political context, of Rome's citizenry-at-arms. Though each century had voting rights, the wealthiest had the most centuries, and voted first, and those beneath them were convened only in the event of deadlock or indecision. The lowest were unlikely to vote at all and was in large exempted from military service.The centuriate classes were as follows:
- 1st class, with 100,000 in asses, infantry self-equipped with helmet, breastplate, greaves, round shield, spear and sword, comprising 40 centuries of seniores, and 40 of iuniores.
- 2nd class, with 75,000 in asses, infantry self-equipped with helmet, greaves, oblong shield, spear and sword, comprising 10 centuries of seniores and 10 of iuniores.
- 3rd class: 50,000 in asses, infantry self-equipped with helmet, oblong shield, spear and sword, comprising 10 centuries of seniores and 10 of iuniores.
- 4th class: 25,000 in asses, infantry self-equipped with oblong shield, spear, javelin, and sword comprising 10 centuries of seniores and 10 of iuniores.
- 5th class: 11,000 asses, infantry self-equipped with sling and sling-stones, comprising 15 centuries of seniores and 15 of iuniores.
- Supernumaries: Proletarii, 1 century. Military specialists: Equites ; 18 centuries. Engineers; 2 centuries. Musicians; 2 centuries.
The Servian reforms established both the Roman army's centuria system and its order of battle; men picked from civilian centuriae were slipped into military ones, and each battle line in the phalanx formation was composed of a single class. In the early Republican era, as during the Regal era, the highest officers of the army were drawn from the same social stratum as the aristocratic comitia curiata. Even after the institution of the comitia centuriata, the most immediate and effective plebeian defense against aristocratic power was the actual or threatened withdrawal of labour, including military service. The first known plebeian officers were elected by the plebs from among their own number after the secession of 494 BC.