Princeps senatus

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Princeps (plural: Principes) is a Latin word meaning "first in time or order; the first, foremost, chief, the most eminent, distinguished, or noble; the first person". As a title, Princeps originated in the Roman Republic wherein the leading member of the Senate was designated princeps senatus. It is primarily associated with the Roman emperors as an unofficial title first adopted by Augustus (r. 27 BC – AD 14) in 27 BC. But it could also refer to leading men of non-Roman states, as well as members of a social order or other elite groups. Its use in this context continued until the regime of Diocletian (r. 284–305) at the end of the third century. He preferred the title of dominus, meaning "lord" or "master". As a result, the Roman Empire from Augustus to Diocletian is termed the "principate" (principatus), and from Diocletian on the "dominate" (dominatus). Other historians define the reign of Augustus to Severus Alexander (r. 222–235) as the Principate, and the period afterwards as the "Autocracy". The medieval title "Prince" goes back to princeps, as does the title Principal.