Rheinsberg is a town and a municipality in the Ostprignitz-Ruppin district, in Brandenburg, Germany. It is situated on the river Rhin, approx. 20 km north-east of Neuruppin and 75 km north-west of Berlin
Frederick the Great, while still Crown Prince, designed and moved into a restored chateau in Rheinsberg shortly after his 1733 marriage to Elisabeth Christine of Brunswick-Bevern. Here he experienced his “Rheinsberg Period“, an era marked by regular correspondence with Voltaire, boisterous celebration in the company of minor philosophers and musicians, and the writing of several works of political theory, including the Anti-Machiavel.