During the Seven Years' War parts of Prussia briefly came under Russian control and were governed by Russian governors. Imperial Russian troops occupied East Prussia at the beginning of 1758. On December 31, 1757, Empress Elizabeth I of Russia issued a ukase about the incorporation of Königsberg into Russia. On January 24, 1758, the leading burghers of Königsberg submitted to Elizabeth. Five Imperial Russian general-governors administered the city during the war from 1758–62; the Russian army did not abandon the town until 1763.
After World War II
The Soviet leader Stalin decided to incorporate the northern part of East Prussia into the Soviet Union. Klaipėda Region became part of the Lithuanian SSR, while Kaliningrad Oblast was associated with the Russian Soviet Federative Socialist Republic. With the end of the Soviet Union in 1991 and the independence of Lithuania and Belarus Kaliningrad Oblast became an exclave of Russia.
- Bolles, Blair (1958). The big change in Europe. Norton. p. 120.
- Jasiński, Janusz (1994). Historia Królewca: szkice z XIII-XX stulecia. Książnica Polska. pp. 80, 103–104. ISBN 8385702032.
- Holborn, Hajo (1964). A History of Modern Germany: 1648-1840. New York: Alfred A. Knopf. p. 245.
- Zammito, John H. (2002). Kant, Herder, and the birth of anthropology. University of Chicago Press. p. 392. ISBN 9780226978598.