Imperium

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.

The term magistrate is used in a variety of systems of governments and laws to refer to a civilian officer who administers the law. In ancient Rome, a magistratus was one of the highest ranking government officers, and possessed both judicial and executive powers. In other parts of the world, such as China, a magistrate was responsible for administration over a particular geographic area. Today, in some jurisdictions, a magistrate is a judicial officer who hears cases in a lower court, and typically deals with more minor or preliminary matters. In other jurisdictions, magistrates are typically trained volunteers appointed to deal with criminal and civil matters in their local areas.

In ancient Rome a promagistrate was a person who was granted the power via prorogation to act in place of an ordinary magistrate in the field. This was normally pro consule or pro praetore, that is, in place of a consul or praetor, respectively. This was expedient developed, starting in 327 BC and becoming regular by 241 BC, that was meant to allow consuls and praetors to continue their activities in the field without disruption.

Arnold Hugh Martin Jones FBA was a prominent 20th-century British historian of classical antiquity, particularly of the later Roman Empire.

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.

Fasces is a bound bundle of wooden rods, sometimes including an axe with its blade emerging. The fasces is an Italian symbol that had its origin in the Etruscan civilization and was passed on to ancient Rome, where it symbolized a magistrate's power and jurisdiction. The axe, originally associated with the labrys the double-bitted axe, originally from Crete, is one of the oldest symbols of Greek civilization. To the Romans, it was known as a bipennis.

The pomerium or pomoerium was a religious boundary around the city of Rome and cities controlled by Rome. In legal terms, Rome existed only within its pomerium; everything beyond it was simply territory (ager) belonging to Rome.

Praetor, also pretor, was the title granted by the government of Ancient Rome to a man acting in one of two official capacities: (i) the commander of an army, and (ii) as an elected magistratus (magistrate), assigned to discharge various duties. The functions of the magistracy, the praetura (praetorship), are described by the adjective: the praetoria potestas, the praetorium imperium, and the praetorium ius, the legal precedents established by the praetores (praetors). Praetorium, as a substantive, denoted the location from which the praetor exercised his authority, either the headquarters of his castra, the courthouse (tribunal) of his judiciary, or the city hall of his provincial governorship.

A cuirass is a piece of armour that covers the torso, formed of one or more pieces of metal or other rigid material. The word probably originates from the original material, leather, from the French cuirace and Latin word coriacea. The use of the term "cuirass" generally refers to both the chestplate and the back piece together; whereas a breastplate only protects the front, a cuirass protects both the front and the back.

The Donation of Constantine is a forged Roman imperial decree by which the 4th-century emperor Constantine the Great supposedly transferred authority over Rome and the western part of the Roman Empire to the Pope. Composed probably in the 8th century, it was used, especially in the 13th century, in support of claims of political authority by the papacy. In many of the existing manuscripts, including the oldest one, the document bears the title Constitutum domini Constantini imperatoris. The Donation of Constantine was included in the 9th-century collection Pseudo-Isidorean Decretals.

Anselm of Lucca, born Anselm of Baggio, was a medieval bishop of Lucca in Italy and a prominent figure in the Investiture Controversy amid the fighting in central Italy between Matilda, countess of Tuscany, and Emperor Henry IV. His uncle Anselm preceded him as bishop of Lucca before being elected to the papacy as Pope Alexander II; owing to this, he is sometimes distinguished as Anselm the Younger or Anselm II.

Gratian was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian accompanied his father on several campaigns along the Rhine and Danube frontiers and was raised to the rank of Augustus in 367. Upon the death of Valentinian in 375, Gratian took over government of the west while his half-brother Valentinian II was also acclaimed emperor in Pannonia. Gratian governed the western provinces of the empire, while his uncle Valens was already the emperor over the east.

Pope Gregory IX was head of the Catholic Church and ruler of the Papal States from 19 March 1227 until his death in 1241. He is known for issuing the Decretales and instituting the Papal Inquisition, in response to the failures of the episcopal inquisitions established during the time of Pope Lucius III, by means of the papal bull Ad abolendam, issued in 1184.

The Holy Roman Emperor, originally and officially the Emperor of the Romans during the Middle Ages, and also known as the Roman-German Emperor since the early modern period, was the ruler and head of state of the Holy Roman Empire. The title was held in conjunction with the title of king of Italy from the 8th to the 16th century, and, almost without interruption, with the title of king of Germany throughout the 12th to 18th centuries.

Frederick II was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225. He was the son of emperor Henry VI of the Hohenstaufen dynasty and Queen Constance of Sicily of the Hauteville dynasty.

The Battle of Cortenuova was fought on 27 November 1237 in the course of the Guelphs and Ghibellines Wars: in it, Holy Roman Emperor Frederick II defeated the Second Lombard League.

King of Kings was a ruling title employed primarily by monarchs based in the Middle East. Although most commonly associated with Iran, especially the Achaemenid and Sasanian Empires, the title was originally introduced during the Middle Assyrian Empire by king Tukulti-Ninurta I and was subsequently used in a number of different kingdoms and empires, including the aforementioned Persia, various Hellenic kingdoms, Armenia, Georgia, and Ethiopia.

A caliphate or khilāfah is an institution or public office under the leadership of an Islamic steward with the title of caliph, a person considered a political-religious successor to the Islamic prophet Muhammad and a leader of the entire Muslim world (ummah). Historically, the caliphates were polities based on Islam which developed into multi-ethnic trans-national empires. During the medieval period, three major caliphates succeeded each other: the Rashidun Caliphate (632–661), the Umayyad Caliphate (661–750), and the Abbasid Caliphate (750–1258). In the fourth major caliphate, the Ottoman Caliphate, the rulers of the Ottoman Empire claimed caliphal authority from 1517. Throughout the history of Islam, a few other Muslim states, almost all hereditary monarchies such as the Mamluk Sultanate (Cairo) and Ayyubid Caliphate, have claimed to be caliphates.

The archbishop of Canterbury is the senior bishop and a principal leader of the Church of England, the ceremonial head of the worldwide Anglican Communion and the bishop of the Diocese of Canterbury. The current archbishop is Justin Welby, who was enthroned at Canterbury Cathedral on 21 March 2013. Welby is the 105th in a line which goes back more than 1400 years to Augustine of Canterbury, the "Apostle to the English", sent from Rome in the year 597. Welby succeeded Rowan Williams.

Thomas Cranmer was a leader of the English Reformation and Archbishop of Canterbury during the reigns of Henry VIII, Edward VI and, for a short time, Mary I. He helped build the case for the annulment of Henry's marriage to Catherine of Aragon, which was one of the causes of the separation of the English Church from union with the Holy See. Along with Thomas Cromwell, he supported the principle of royal supremacy, in which the king was considered sovereign over the Church within his realm.

The crown is the state in all its aspects within the jurisprudence of the Commonwealth realms and their subdivisions. The term can be used to refer to the office of the monarch or the monarchy as institutions, as opposed to the monarch as a private individual; to the rule of law; or to the functions of executive, legislative, and judicial governance and the civil service.

The Church of England is the established Christian church in England. It traces its history to the Christian church recorded as existing in the Roman province of Britain by the 3rd century and to the 6th-century Gregorian mission to Kent led by Augustine of Canterbury. Its adherents are called Anglicans.

Autokrator or Autocrator is a Greek epithet applied to an individual who is unrestrained by superiors. It has been applied to military commanders-in-chief as well as Roman and Byzantine emperors as the translation of the Latin title imperator. Its connection with Byzantine-style absolutism gave rise to the modern terms autocrat and autocracy. In Modern Greek, it means "emperor", and its feminine form is autokráteira (αὐτοκράτειρα).