Queen of France, secretly loves Buckingham, central to the diamond brooch plot
Their restrained affair directly creates the brooch crisis.
The plot says Buckingham loves Anne, while Anne remains faithful to Louis; she later gives Buckingham her diamond brooch as a keepsake.
Their marriage is threatened by Richelieu's manipulation and the missing brooch.
Anne is identified as the Queen of France, and Louis gives her a diamond-encrusted brooch. The plot also states that Louis loves his wife Anne.
Richelieu targets Anne as the central obstacle to his influence.
Anne is described as the greatest obstacle to Richelieu's dominance, and Richelieu attempts to dishonor her through the missing brooch.
Constance serves Anne and acts to protect the Queen's reputation.
Constance is identified as the Queen's seamstress and asks d'Artagnan to retrieve the brooch so Anne will not be dishonored.
D'Artagnan becomes the agent who safeguards Anne from public dishonor.
D'Artagnan travels to England, retrieves the brooch, and returns to Paris to deliver it to Queen Anne.
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Related entry on Wikidata (Q151209), public domain (CC0).