Princeps (plural: principes) is a Latin word meaning "first in time or order; the first, chief, the most eminent, distinguished, or noble; the first man, first person."[1]
This article is devoted to a number of specific historical meanings the word took, in approximate historical order.
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Princeps (in this sense usually translated as "First Citizen") was an official title of a Roman Emperor as the title determining the leader in Ancient Rome at the beginning of the Roman Empire. It created the principate Roman imperial system.[2]
The word "Princeps" derived from Princeps Senatus ("Primus inter pares" of the Senate). The princeps senatus (plural principes senatus) was the first member by precedence of the Roman Senate.
It was first given as a special title to Caesar Augustus in 27 BC[3] , who circumspectly saw that use of the titles rex (king) or dictator would create resentment amongst senators and other influential men, who had earlier demonstrated their disapproval by supporting the assassination of Julius Caesar. While Augustus had political and military supremacy, he needed the assistance of his fellow Romans to manage the Empire. In his Res Gestae, Augustus claims auctoritas for the princeps (himself).[2]
For a comprehensive list of other official Roman titles used for the office of emperor see Roman Emperor. These titles included imperator, Augustus, Caesar, and later dominus (lord) and basileus (the Greek word for "sovereign"). The word Emperor itself is derived from the Roman title 'imperator', which was a very high, but not exclusive, military title until Augustus began to use it as his praenomen.
The Emperor Diocletian (285-305), the father of the Tetrarchy, was the first to stop referring to himself as "princeps" altogether, calling himself 'dominus' (lord, master), thus dropping the pretense that emperor was not truly a monarchical office. The period when the emperors that called themselves princeps ruled - from Augustus to Diocletian - is called "the Principate", while no later than under Diocletian began "the Dominate" period.
Ancient Rome knew another kind of 'princely' principes too, like 'princeps iuventutis' ("the first amongst the young"), which in the early empire was frequently bestowed on eligible successors to the emperor, especially from his family. It was first given to Augustus' adoptive sons Gaius and Lucius.[4]
Princeps is also the (official) short version of Princeps officii, the chief of an officium (the office staff of a Roman dignitary) -
Princeps was also used as defining second part of various other military titles, such as Decurio princeps, Signifer princeps (among the standard-bearers). See also Principalis (as in Optio principalis): NCO.
"Princeps" is the root and Latin rendering of modern words as the English title and generic term prince (see that article, also for various equivalents in other languages), as the Byzantine version of Roman law was the basis for the legal terminology developed in feudal (and later absolutist) Europe.
"Princeps" is also the name of an obsolete genus of Swallowtail butterflies (now merged with the genus Papilio).