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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 () in 27 BC. 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