Shakespeare developed this historical story to write a play that would be fit for royal entertainment.
The play opens at a time when Scotland is at war- on one hand countering Macdonald's rebellion, and on the other facing the Norwegian king Sweno and the traitorous Thane of Cawdor's combined attack. Macbeth's bravery as he faces his rivals is highly spoken of before the man actually appears on stage- in Act I, Scene II, an injured captain reports to Duncan and his entourage how "brave Macbeth" fought on the battlefield against the rebel Macdonald: " Like Valour's minion carv'd out his passage/ Till he fac'd the slave / Which ne'er shook hands, nor bade farewell to him / Till he unseam'd him from the nave to th' chaps/ And fix'd his head upon our battlements."
Shortly afterwards, the Thane of Ross enters and tells Duncan how Macbeth had confronted Sweno and the Thane of Cawdor, seeming as though he were the bridegroom of Bellona, the Roman goddess of war, till he won the battle for Scotland. Thus, the audience is told of Macbeth's great bravery, and of Duncan's complete trust in him. The audience is encouraged to think well of Macbeth- but we know something is amiss, for the three witches have planned to meet Macbeth, and it us wonder what Macbeth can have to do with the witches.
This question is answered soon as the three