St. Germain appeared in the French court around 1748.

 Begin partial quote from:

https://en.wikipedia.org/wiki/Count_of_St._Germain

France

St. Germain appeared in the French court around 1748. In 1749, he was employed by Louis XV for diplomatic missions.^[16]

A mime and English comedian known as Mi'Lord Gower impersonated St. Germain in Paris salons. His stories were wilder than the real count's (he had advised Jesus, for example). Inevitably, hearsay of his routine got confused with the original.^{[citation needed]}

Giacomo Casanova describes in his memoirs several meetings with the "celebrated and learned impostor". Of his first meeting, in Paris in 1757, he writes:

The most enjoyable dinner I had was with Madame de Robert Gergi, who came with the famous adventurer, known by the name of the Count de St. Germain. This individual, instead of eating, talked from the beginning of the meal to the end, and I followed his example in one respect as I did not eat, but listened to him with the greatest attention. It may safely be said that as a conversationalist he was unequalled.

St. Germain gave himself out for a marvel and always aimed at exciting amazement, which he often succeeded in doing. He was a scholar, linguist, musician, and chemist, good-looking, and a perfect ladies' man. For a while he gave them paints and cosmetics; he flattered them, not that he would make them young again (which he modestly confessed was beyond him) but that their beauty would be preserved by means of a wash which, he said, cost him a lot of money, but which he gave away freely. He had contrived to gain the favour of Madame de Pompadour, who had spoken about him to the king, for whom he had made a laboratory, in which the monarch – a martyr to boredom – tried to find a little pleasure or distraction, at all events, by making dyes. The king had given him a suite of rooms at Chambord, and a hundred thousand francs for the construction of a laboratory, and according to St. Germain the dyes discovered by the king would have a materially beneficial influence on the quality of French fabrics.

This extraordinary man, intended by nature to be the king of impostors and quacks, would say in an easy, assured manner that he was three hundred years old, that he knew the secret of the Universal Medicine, that he possessed a mastery over nature, that he could melt diamonds, professing himself capable of forming, out of ten or twelve small diamonds, one large one of the finest water without any loss of weight. All this, he said, was a mere trifle to him. Notwithstanding his boastings, his bare-faced lies, and his manifold eccentricities, I cannot say I thought him offensive. In spite of my knowledge of what he was and in spite of my own feelings, I thought him an astonishing man as he was always astonishing me.^[17]