On the elevation of Anne to the Russian throne in 1740, Biren, who had in the meantime married a Fraulein von Treiden, came to Moscow, and honours and riches were heaped upon him.
A few years later he married Fraulein Loisinger, an actress, and assumed the style of Count Hartenau (February 6, 1889).
After being educated at Berlin, Gottingen and Jena, in the last of which places he formed a close and lifelong friendship with Schiller, he married Fraulein von Dacherode, a lady of birth and fortune, and in 1802 was appointed by the Prussian government first resident and then minister plenipotentiary at Rome.
In the heyday of his passion for Fraulein von DOnniges, his dream was to be enthroned as the president of the German republic with her seated at his side.
In one of the literary and fashionable circles of Berlin he had met a Fraulein von Ddnniges, for whom he at once felt a passion, which was ardently reciprocated.