Agdolo, as all the ladies knew, was a great rascal. He had been pensioned by Prince Xavier with six hundred dollars per annum, and he had what he received from the Electress Mother as her gentleman-in-waiting. He was married to the Princess Lubomirska, widow of Count Rutowska, had quarrelled with her, and they lived separate, but he had no scruple to receive of an insulted wife an annual allowance. All these sources of income were insufficient to meet his expenses; and no one who knew him doubted for a moment that he would lend himself to any intrigue which would promise him wealth and position. The plot of the Dowager Electress was a risky one—but, should it succeed, his fortune was assured.
At Dresden he was well received by the Elector; and Frederick Augustus at once accepted the proposition of his mother. He consented to purchase Maria Antonia's resignation in his favour of her claims on the allodial inheritance of the family on the extinction of the Bavarian Electoral house in the male line, and to pay all her debts, and to find a sum sufficient to redeem the diamonds, which were represented as still in pawn at Rome.
Maria Antonia and her confidant appeared to be on the eve of success, when the plan was upset, from a quarter in which they had not dreamed of danger. Among the ladies of the court of the Dowager Electress was one whose name does not transpire, who seems to have entertained an ardent passion for Agdolo. He, however, disregarded her, and paid his attentions to another of the ladies. Rage and jealousy consumed the heart of this slighted beauty, and when the Electress Mother confided to her the plan she had formed, the lady-in-waiting saw that her opportunity had arrived for the destruction of the man who had slighted her charms. She managed to get hold of her mistress' keys and to make a transcript of her papers, wherein the whole plan was detailed, also of copies of her letters to Agdolo, and of the Marquis's letters to her. When she had these, she at once despatched them—not to the Elector of Saxony, but to Frederick II. at Berlin, who stood in close relations of friendship with the Elector of Saxony. She had reckoned aright. Such tidings, received through the Court of Prussia, would produce a far deeper impression on Frederick Augustus, than if received from her unknown and insignificant self. It is possible also that she may have known of her mistress having been at Berlin and there thrown out hints of something of the sort, so that Frederick II. would at once recognise in this matured plan the outcome of the vague hints of mischief poured out at Potsdam a few years before.
All was going on well at Berlin. Adolphus von Zehmen, Electoral Treasurer, had already started for Munich, furnished with the requisite sums. He was empowered to receive the deed of relinquishment from the Dowager Electress, and also her diamond necklace, which, in the meantime, was to be brought by a special courier from Rome. Maria Antonia, on her side, had constituted Councillor Hewald her plenipotentiary; she wrote to say that he would transact all the requisite negociation with the Treasurer Zehmen, and that the diamond necklace had arrived and was in his hands.
Agdolo received orders from the Electress Mother on no account to leave Dresden till the middle of September, 1776, lest his departure should arouse suspicion.
The conduct of the Marquis was not in any way remarkable, he moved about among old friends with perfect openness, often appeared in Court, and was satisfied that he was perfectly safe. He was not in the least aware that all his proceedings were watched and reported on, not by order of the Elector, but of his own mistress, who received regular reports from this emissary as to the behaviour and proceedings of the Marquis, so that she was able to compare with this private report that sent her by Agdolo, and so satisfy herself whether he was acting in her interest, or playing a double game.
This bit of cunning on her part, was not surprising, considering what a man Agdolo was, and, as we shall see, it proved of great advantage to her, but in a way she least expected.
The Marchese d'Agdolo had paid his farewell visit to the Elector, and received leave to depart. Frederick Augustus had not the remotest suspicion that his mother was playing a crooked part, and he seemed heartily satisfied with the negociation, and made the Marquis a present.
On September 15, 1776, Agdolo was intending to start from Dresden, on his return to Munich, and the evening before leaving he spent at the house of a friend, Ferber, playing cards. Little did he suspect that whilst he was winning one stake after another at the table, the greatest stake of all was lost. That evening, whilst he was playing cards, a courier arrived from Berlin, in all haste, and demanded to see the Elector in person, instantly, as he had a communication of the utmost importance to make from Frederick II. He was admitted without delay, and the whole of his mother's plot was detailed before the astonished Elector.