The Man in the Iron Mask Theme of Loyalty

In The Man in the Iron Mask, loyalties are continually being pitted against each other. Characters in the novel are always expected to first and foremost be loyal to the King, but this requirement sometimes conflicts with loyalties to friends, family, or self-interest.

1. Who in the novel has the greatest loyalty to the King? Why?
2. Why is D'Artagnan so loyal to the King?
3. What type of loyalty in The Man in the Iron Mask proves to be the strongest? Loyalty to friends? The King? One's self?
4. How is loyalty defined in the novel?

Out of all the courtiers, D'Artagnan has the greatest loyalty to the King.