Countess Of Cosel, mistress of Augustus II., king of Poland and elector of Saxony, born in Holstein in 1680, died in the prison of Stolpen in March, 1765. She was a daughter of the Danish colonel Brockdorf, and married the Saxon minister Von Hoymb; but on forming an illicit connection with Augustus she was divorced from her husband, assumed the name of Madame de Cosel, was presented by the emperor Joseph I. with the title of countess, and by her lover with a magnificent palace at Dresden (still known there under her name), and held for a number of years sovereign sway over the heart and the councils of Augustus, to whom she bore three children, until her extravagance, arrogance, and jealousy caused her to be imprisoned in the fortress of Stolpen (1716). She was in the enjoyment of a pension, which continued to be paid to her after the death of Augustus in 1733. Frederick the Great, during his occupation of Saxony, paid it in depreciated coins called Ephraims, after a Jew of Leipsic of the name of Ephraim, by whom they were made. Incensed at the deception, the countess nailed the coins on the walls of her prison.

She seemed, however, so fond of the society of the same Ephraim and of other Jews, that she was supposed to have become a convert to Judaism. The coins known as the florins de Cosel, struck from 1705 to 1707, and bearing an obscene device, were issued by King Augustus in payment of a wager with his mistress.