sentences:  In 1789, Alopeus was sent to Berlin where he stayed for 6 years, gained favor from Frederick William II, and secured the signing of the allied treaty between Russia and Prussia.He was named minister plenipotentiary at the court of Berlin, by the Empress Catherine, in 1790.In 1795, Prussia having withdrawn from the coalition by the Treaty of Basel, he remonstrated; and in 1796, he left Berlin, to which court he did not return till 1802.