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As the play begins, Macbeth and Banquo are friends and comrades in arms, both Scottish noblemen and valiant defenders of King Duncan. The first description of them concerns how fiercely they had recently fought together to defeat the forces of the King of Norway and Macdonwald, a traitor to the King.
Macbeth and Banquo together encounter the witches on the heath where Macbeth hears their prophecy for the first time. Banquo reacts as a friend would at the sound of Macbeth's good fortune, and then seeks to know his own future. Shortly after, Banquo warns Macbeth of danger, explaining that the witches may not be trustworthy:
And oftentimes, to win us to our harm, the instruments of darkness tell us truths; Win us with honest trifles, to betray'sIn deepest consequence.
By the end of Act I, Banquo still relates to Macbeth as his friend. Banquo has noticed strangeness in Macbeth's behavior, but assumes it is merely a reaction to the new honor (Thane of Cawdor) he has suddenly received. Macbeth and Banquo maintain their friendship into Act II, when Banquo mentions the witches. Macbeth lies, saying he never thinks of them, but tells Banquo that he would like to discuss them further. Macbeth then seeks