Among the numerous foreign princes who danced and clicked their heels in the victory celebrations was one who appeared to Charlotte’s inexperienced eyes quite perfect. He was thirty-five, but that did not trouble her. He had been invited to London on account of his bravery at the Battle of Leipzig, and throughout the French campaign. Friedrich Wilhelm Heinrich August von Preussen, to give him his full name, was the son of Prince Ferdinand*, the youngest brother of Frederick the Great. In compliment to their valiant uncle all Prince Ferdinand’s children were baptized Frederick or Frederica, which must have caused some confusion in the nursery, but later the first name was dropped. Charlotte adds to the confusion by referring to her prince as ‘F’ in her letters, for there were crops of Fredericks all over Europe, and this one was generally known as August.
He was a distinguished soldier; handsome in a conventional military way, tall, and with a figure that looked its best in uniform. Poor Dutch William must have looked plain and shrimp-like beside him. An experienced philanderer, he had little difficulty in winning Charlotte’s vulnerable heart. He probably saw her for the first time at Carlton House when, as William had noted, she was ‘in great beauty’; and after this they met clandestinely and often. It would not have been difficult for Prince August to capture her imagination with stories of his glamorous career.
‘She loved me for the dangers I had passed,
And I loved her, that she did pity them.’
But did he? Charlotte, deluded as she was, believed their passion to be mutual, and for ever. She hung upon his every word: they exchanged rings. He swore that when he returned to Prussia he would write. And romantic, misguided, idiotic Miss Knight, enthusiastically encouraging what she believed was to be a grande passion, offered to receive and pass on his letters.
She could hardly have back a less suitable horse. Prince August was a notorious womanizer, and had begotten several children in Prussia. In 1807 he fell violently in love with the famous beauty, Madame Récamier, whom he met at Madame de Staël’s house, the Château de Coppet. She had been married for fourteen years to a banker Jacques Récamier, who was impotent; at Prince August’s request she wrote to her husband, begging him to release her. His reply, imploring her not to leave him, touched her heart, and Prince August was obliged to give her up, which he did with some bitterness and in indifferent French, ‘Je vous prie de ne plus m’écrire: vos lettres me font trop de mal. Adieu pour le dernière fois.’ He never forgot her. He had his portrait painted with her picture by Gerard in the background, and he is said to have spent hours gazing at her reclining, semi-nude beauty.
However, according to his biographer, Friedrich von Oppeln-Bronikows[k]i (Liebesgeschichten am Preussischen Hofe, Berlin 1928) he did not despair because of that unfulfilled love, but had one affair after another, or sometimes several at a time. ‘His harem,’ it was said, ‘was the talk of the town.’
No one, at this stage, murmured a word of warning to Charlotte, till one day when Mercer arrived unexpectedly at Warwick House and was met by an agitated Miss Knight. Charlotte, she whispered, was alone with Prince August in her room. Mercer insisted that this tête à tête must be broken up at once, and, as Cornelia demurred, did so herself. ‘She evidently,’ said Greville, ‘had no mind that anybody should conduct such an affair for the Princess but herself.’ Although, a month or two later she was lending a sympathetic ear to Charlotte’s outpourings on the subject of ‘F’, she saw at once that in her present precarious situation the affair must at all costs be kept quiet: Miss Knight must be mad to encourage it.
[an extract from ‘Prinny’s Daughter: A Biography of Princess Charlotte of Wales’ by Thea Home]
* He was the Louis Ferdinand who, Princess Caroline preposterously claimed, was the father of Wilikin. [In reality he was Prince Louis Ferdinand’s brother, not son. They were both the sons of Prince Augustus Ferdinand of Prussia. For more details see Wikipedia https://en.wikipedia.org/wiki/Prince_Augustus_Ferdinand_of_Prussia#Marriage_and_children ]