Shakespeare borrowed the character Banquo from "Holinshed's Chronicles", a history of Britain published by Raphael Holinshed in 1587. In "Chronicles" Banquo is an accomplice to Macbeth in the murder of the king, rather than a loyal subject of the king who is seen as an enemy by Macbeth. Shakespeare may have changed this aspect of his character to please King James, who was thought at the time to be a descendant of the real Banquo. Critics often interpret Banquo's role in the play as being a foil to Macbeth, resisting evil whereas Macbeth embraces it. Sometimes, however, his motives are unclear, and some critics question his purity. He does nothing to accuse Macbeth of murdering the king, even though he has reason to believe Macbeth is responsible.