Final answer:
In Shakespeare's 'Macbeth,' Ross is the character who informs King Duncan about the Norwegian invasion and the thane of Cawdor's betrayal.
Step-by-step explanation:
In Shakespeare's play Macbeth, it is Ross who brings King Duncan news of the Norwegian invasion and of the thane of Cawdor's treachery. The information provided by Ross helps to set the stage for Macbeth's rise to power, as he is named the new thane of Cawdor by Duncan after the original thane is discredited. This news is significant as it confirms the witches' prophecy, further enticing Macbeth into believing in his eventual kingship.