Noun
the domain controlled by a grand duke or grand duchess
Source: WordNetHeidelberg Castle 1670 Mannheim Palace Schwetzingen Castle After the Empire In 1806, Baden was raised to a grand duchy and parts of the former Palatinate including Mannheim became part of the new grand duchy. Source: Internet
In 1953, Mr. Buchanan was named minister to the Grand Duchy of Luxembourg, replacing Perle Mesta, the American socialite and ambassador. Source: Internet
“They can simply get on any public transportation means in order to discover the Grand Duchy.” Source: Internet