Kingship and Divine Right
The theme of kingship wasn't just academic for Shakespeare's audience - King James I had recently survived an assassination attempt, making this play incredibly relevant and potentially dangerous.
Duncan represents the ideal king - noble, generous, and trusting. His "golden opinions" show he's valued by everyone, and his benevolent nature makes his murder even more shocking. However, his hamartia (fatal flaw) is trusting others too quickly, which ultimately leads to his death.
Macbeth embodies everything a king shouldn't be - paranoid, violent, and illegitimate. His reign is described as a "fruitless crown and barren sceptre," suggesting he'll leave no positive legacy. The metaphor emphasises that only rightful kings, chosen by God, can truly succeed and be remembered positively.
The Divine Right of Kings underpins the entire play's moral framework. By committing regicide, Macbeth breaks the Great Chain of Being and goes against God's will. Malcolm calls him a "dead butcher," contrasting sharply with his initial description as a "valiant soldier." Malcolm's eventual restoration represents natural order returning to Scotland.
Macbeth's murder occurs off-stage, emphasising the horror whilst building tension. His unnatural rise to power through murder leads to an equally violent end, showing that those who gain power through evil means will inevitably face justice.
Divine Justice: Shakespeare reinforces the Jacobean belief that God chooses kings, and those who steal the crown through murder will face both earthly and eternal punishment.