Political institutions of ancient Rome

Roman law is the legal system of ancient Rome, including the legal developments spanning over a thousand years of jurisprudence, from the Twelve Tables, to the Corpus Juris Civilis ordered by Eastern Roman emperor Justinian I. Roman law forms the basic framework for civil law, the most widely used legal system today, and the terms are sometimes used synonymously. The historical importance of Roman law is reflected by the continued use of Latin legal terminology in many legal systems influenced by it, including common law.

The Laws of the Twelve Tables was the legislation that stood at the foundation of Roman law. Formally promulgated in 449 BC, the Tables consolidated earlier traditions into an enduring set of laws.

The Digest, also known as the Pandects, is a name given to a compendium or digest of juristic writings on Roman law compiled by order of the Byzantine emperor Justinian I in 530–533 AD. It is divided into 50 books.

The Corpus Juris Civilis is the modern name for a collection of fundamental works in jurisprudence, issued from 529 to 534 by order of Justinian I, Byzantine Emperor. It is also sometimes referred to metonymically after one of its parts, the Code of Justinian.

The Roman Senate was a governing and advisory assembly in ancient Rome. It was one of the most enduring institutions in Roman history, being established in the first days of the city of Rome. It survived the overthrow of the Roman monarchy in 509 BC; the fall of the Roman Republic in the 1st century BC; the division of the Roman Empire in AD 395; and the fall of the Western Roman Empire in 476; Justinian's attempted reconquest of the west in the 6th century, and lasted well into the Eastern Roman Empire's history.

The Roman Assemblies were institutions in ancient Rome. They functioned as the machinery of the Roman legislative branch, and thus passed all legislation. Since the assemblies operated on the basis of a direct democracy, ordinary citizens, and not elected representatives, would cast all ballots. The assemblies were subject to strong checks on their power by the executive branch and by the Roman Senate. Laws were passed by Curia, Tribes, and century.

Aedile was an elected office of the Roman Republic. Based in Rome, the aediles were responsible for maintenance of public buildings and regulation of public festivals. They also had powers to enforce public order and duties to ensure the city of Rome was well supplied and its civil infrastructure well maintained, akin to modern local government.

The decemviri or decemvirs refer to official 10-man commissions established by the Roman Republic.

Dux is Latin for "leader" and later for duke and its variant forms. During the Roman Republic and for the first centuries of the Roman Empire, dux could refer to anyone who commanded troops, both Roman generals and foreign leaders, but was not a formal military rank.

The Latin word imperator derives from the stem of the verb imperare, meaning 'to order, to command'. It was originally employed as a title roughly equivalent to commander under the Roman Republic. Later it became a part of the titulature of the Roman Emperors as their praenomen. The English word emperor derives from imperator via Old French: Empereür. The Roman emperors themselves generally based their authority on multiple titles and positions, rather than preferring any single title. Nevertheless, imperator was used relatively consistently as an element of a Roman ruler's title throughout the Principate and the Dominate.

A legatus was a high-ranking Roman military officer in the Roman Army, equivalent to a modern high-ranking general officer. Initially used to delegate power, the term became formalised under Augustus as the officer in command of a legion.

A legatus Augusti pro praetore was the official title of the governor or general of some Imperial provinces of the Roman Empire during the Principate era, normally the larger ones or those where legions were based. Provinces were denoted imperial if their governor was selected by the emperor, in contrast to senatorial provinces, whose governors were elected by the Roman Senate.

A lictor was a Roman civil servant who was an attendant and bodyguard to a magistrate who held imperium. Lictors are documented since the Roman Kingdom, and may have originated with the Etruscans.

The pontifex maximus was the chief high priest of the College of Pontiffs in ancient Rome. This was the most important position in the ancient Roman religion, open only to patricians until 254 BC, when a plebeian first occupied this post. Although in fact the most powerful office in the Roman priesthood, the pontifex maximus was officially ranked fifth in the ranking of the highest Roman priests, behind the rex sacrorum and the flamines maiores.

Praefectus, often with a further qualification, was the formal title of many, fairly low to high-ranking, military or civil officials in the Roman Empire, whose authority was not embodied in their person but conferred by delegation from a higher authority. They did have some authority in their prefecture such as controlling prisons and in civil administration.

The patricians were originally a group of ruling class families in ancient Rome. The distinction was highly significant in the Roman Kingdom, and the early Republic, but its relevance waned after the Conflict of the Orders. By the time of the late Republic and Empire, membership in the patriciate was of only nominal significance.

Auctoritas is a Latin word which is the origin of English "authority". While historically its use in English was restricted to discussions of the political history of Rome, the beginning of phenomenological philosophy in the 20th century expanded the use of the word.

In the history of Rome, the Latin term civitas, according to Cicero in the time of the late Roman Republic, was the social body of the cives, or citizens, united by law. It is the law that binds them together, giving them responsibilities (munera) on the one hand and rights of citizenship on the other. The agreement (concilium) has a life of its own, creating a res publica or "public entity", into which individuals are born or accepted, and from which they die or are ejected. The civitas is not just the collective body of all the citizens, it is the contract binding them all together, because each of them is a civis.

A consortium is an association of two or more individuals, companies, organizations or governments with the objective of participating in a common activity or pooling their resources for achieving a common goal.

The cursus honorum was the sequential order of public offices held by aspiring politicians in the Roman Republic and the early Roman Empire. It was designed for men of senatorial rank. The cursus honorum comprised a mixture of military and political administration posts; the ultimate prize for winning election to each "rung" in the sequence was to become one of the two consuls in a given year. Each office had a minimum age for election; there were also minimum intervals between holding successive offices and laws forbade repeating an office.

The Digest, also known as the Pandects, is a name given to a compendium or digest of juristic writings on Roman law compiled by order of the Byzantine emperor Justinian I in 530–533 AD. It is divided into 50 books.

Aequitas is the Latin concept of justice, equality, conformity, symmetry, or fairness. It is the origin of the English word "equity". In ancient Rome, it could refer to either the legal concept of equity, or fairness between individuals.

Ius or Jus in ancient Rome was a right to which a citizen (civis) was entitled by virtue of his citizenship (civitas). The iura were specified by laws, so ius sometimes meant law. As one went to the law courts to sue for one's rights, ius also meant justice and the place where justice was sought.

Libertas is the Roman goddess and personification of liberty. She became a politicised figure in the Late Republic, featured on coins supporting the populares faction, and later those of the assassins of Julius Caesar. Nonetheless, she sometimes appears on coins from the imperial period, such as Galba's "Freedom of the People" coins during his short reign after the death of Nero. She is usually portrayed with two accoutrements: the rod and the soft pileus, which she holds out, rather than wears.