Answer:
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Persona non grata from Latin- an unwelcome person.
This term is usually used in diplomacy, when due to some criminal/political actions a person is prohibited to enter a country. For example if a member of diplomatic mission is caught carrying out espionage missions he can be labeled "persona non grata", forced to leave a country and cannot return.
Persona non grata can also be used in less formal situation, when someone is not welcome in society/community due to his behavior.
In <em>Macbeth's </em>Act 1 Scene 1, both Banquo and Macbeth wonder (D) whether the prophecy about Banquo is true.
In the Royal Palace, Banquo thinks about the prophecy of the witches. At the beginning of the play, the sisters had foretold that he would become the father of a line of kings, but they had also predicted that Macbeth would become Thane of Cawdor, which immediately came true. For this reason, Macbeth fears he will not have a heir to the throne and also wonders about the possibility of Banquo's line to sit on the throne in his soliloquy, where he confesses to feel threatened by his friend.