Banquo - 2nd try

The person that Macbeth fears could most easily undo his plans to stay king is Banquo. Banquo has a suspicion that Macbeth has "played'st most foully for't" and indeed Macbeth had. Macbeth knows that the three witches have made a promise with Banquo that one day his sons will be kings. Macbeth decides that because Banquo is too noble - "in his royalty of nature Reigns that which would be feared." the only way to stop Banquo ruining his plans is to kill him and his son. So Macbeth orders three Murderers to kill Banquo and his son and later on that same night Banquo has his throat cut by "the best o'th'cut-throats" - however Fleance escapes and Macbeth is fearful. Another reason Macbeth orders Banquo killed is that he knows that Banquo would never be involved in any kind of crime so therefore killing is the only way to remove the threat.