They are one of the oldest extant Prussian noble families, being first attested to in 1204. On 2 October 1786, one branch of the family was raised to the title of Count in Prussia by King Frederick William II, while a second branch was raised to the same title in 1870 by King William I of Prussia.[1] The Count von Arnim-Boitzenburg was one of the hereditary members of the Prussian House of Lords from 1852-1918, when it was dissolved.[2] Numerous branches of the family still exist today. Perhaps the most famous member of the family was the novelist, Countess Elizabeth von Arnim-Schlagenthin.