(Modern German spelling , ; ; ) is a German word for Empire in its meaning as a state ruled over by an Emperor, used in the 18th and 19th centuries.Paul Anton Fedor Konstantin Possart, Das Kaiserthum Rußland (in multiple parts), Literatur-Comptoir, Stuttgart, 1840 & 1841 It is most known as a description of the Empire of Austria after its creation in 1804.Reichs-Gesetz-Blatt für das Kaiserthum Oesterreich. Jahrgang 1858 A later used German term for it is .
See also Kingdom of Hungary (1526–1867)
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