And it was not only over men that Frances Stuart cast the spell of her witchery.  One of her earliest and most ardent admirers was none other than my Lady Castlemaine herself, who alone claimed to hold her Sovereign’s heart.  So secure she thought herself of her supremacy that she not only took the French beauty into favour, but actually encouraged Charles in his pursuit of her, probably little realising how dangerous a rival she was taking to her bosom.  It is said that this was but an artifice to divert Charles’s attention from an intrigue that she was carrying on with that rakish beau, Henry Jermyn; but, whatever the cause, there is no doubt that for a time she lost no opportunity of throwing her Royal lover and the fair Stuart together.  She even looked on smilingly at a mock marriage, at one of her own entertainments, between the pair—­“with ring and all other ceremonies of church service and ribands, and a sack-posset in bed, and flinging the stocking, evincing neither anger nor jealousy, but entering into the diversion with great spirit.”

And not only did she thus trifle with fire; for some months she rarely saw the King but in Miss Stuart’s presence.

“The King,” to quote Hamilton again, “who seldom neglected to visit the Countess before she rose, seldom failed likewise to find Miss Stuart with her.  The most indifferent objects have charms in a new attachment; however, the Countess was not jealous of this rival’s appearing with her in such a situation, being confident that whenever she thought fit, she could triumph over all the advantages which these opportunities could afford Miss Stuart.”

As a matter of fact Charles’s maitresse en titre regarded the “Mademoiselle” as nothing more dangerous than a pretty, winsome child.  “She is a lovely little thing,” she once said patronisingly, “but she is only a spoiled child, fonder of her toys and games than of the finest lover in the world.”  But she was not long left in this unsuspicious Paradise.  There was soon no doubt that the “child” had made a conquest of the King, and that she, the mother of his children, no longer held the throne of his heart.

Her first rude disillusionment came when Charles was presented by Gramont with “the most elegant and magnificent carriage (called a ‘calash’) that had ever been seen.”  The Queen herself and Lady Castlemaine each decided that she and no other should be the first to take an airing in Hyde Park in this georgeous vehicle, which was sure to create an unparalleled sensation; and each exerted her utmost arts and eloquence to secure this concession from the King.

“Miss Stuart, however, had the same wish and requested to have the calash on the same occasion.  The Queen retired in disdain from such a contest, while the King was driven to distraction between the cajoling and threats of the two rival beauties.”

It was Miss Stuart, however, who won the day, to Lady Castlemaine’s unrestrained rage and disgust.  The child had scored the first point in the duel, the prize of which was the King’s favour.