Final answer:
King Duncan and Macbeth are related through their roles in the Scottish monarchy. Duncan regards Macbeth with respect and favor, while Macbeth initially regards Duncan with loyalty. However, Macbeth's regard for Duncan changes as he becomes consumed by ambition and plots his murder.
Step-by-step explanation:
King Duncan and Macbeth are related through their roles in the Scottish monarchy. King Duncan is the reigning king of Scotland, while Macbeth is a nobleman and one of his trusted generals. As king, Duncan regards Macbeth with respect and favor, as shown when he awards Macbeth the title of Thane of Cawdor. Macbeth, initially, regards King Duncan with loyalty and reverence, as he performs his duties faithfully and acknowledges his gratitude towards the king. However, Macbeth's regard for King Duncan changes as he becomes consumed by ambition and a desire for power, eventually leading him to plot and carry out Duncan's murder.