The royal "we", or majestic plural (pluralis majestatis in Latin, literally, "the plural of majesty"), is the use of a plural pronoun (or corresponding plural-inflected verb forms) to refer to a single person holding a high office, such as a sovereign (e.g., a monarch) or religious leader (e.g., the Pope). The more general word for the use of a we to refer to oneself is nosism.
Speakers employing the royal we refer to themselves using a grammatical number other than the singular (i.e., in plural or dual form). For example, the Basic Law of the Sultanate of Oman opens with "On the Issue of the Basic Law of the State We, Qaboos bin Said, Sultan of Oman...".
It is commonly employed by a person of high office, such as a monarch, earl, or pope. It is also used in certain formal contexts by bishops and university rectors. William Longchamp is credited with its introduction to England in the late 12th century, following the practice of the Chancery of Apostolic Briefs.
In the public situations in which it is used, the monarch or other dignitary is typically speaking not only in his or her personal capacity but also in an official capacity as leader of a nation or institution. In the grammar of several languages, plural forms tend to be perceived as deferential and more polite than singular forms. This grammatical feature is common in languages that have the T-V distinction, including those such as English, which used to have a T-V distinction in the past, but lost it.
In diplomatic letters, such as letters of credence, it is customary for monarchs to use the singular first-person when writing to other monarchs, but the majestic plural is used in royal letters to a president of a republic.