WIKIPEDIA (don’t miss the final line !!!):
The majestic plural (pluralis maiestatis/majestatis in Latin, literally, “the plural of majesty,” maiestatis being in the genitive case), is the use of a plural pronoun to refer to a single person holding a high office, such as a monarch, bishop, or pope. It is also called the royal pronoun, the royal “we” or the Victorian “we.” The more general word for the use of we to refer to oneself is nosism, from the Latin nos. It is most commonly used to denote the excellence, power, and dignity of the person that speaks or writes.
In pluralis maiestatis a speaker refers to her- or himself using a grammatical number other than the singular (i.e., in plural or, where attested, dual form). For example, the Basic Law of the Sultanate of Oman opens thus:
“On the Issue of the Basic Law of the State We, Qaboos bin Said, Sultan of Oman.”
