The Grand Duchy of Luxembourg.
The official name of Luxembourg is the Grand Duchy of Luxembourg.
The Grand Duchy of Pontevedro.
Luxembourg City is the capital of the Grand Duchy of Luxembourg.
Grand Duchy of Baden ended in 1918.
Grand Duchy of Baden was created in 1806.
Grand Duchy of Berg was created in 1807.
Grand Duchy of Berg ended in 1813.
Grand Duchy of Tuscany was created in 1569.
Grand Duchy of Tuscany ended in 1859.
Grand Duchy of Moscow ended in 1547.
Grand Duchy of Moscow was created in 1263.
The Grand Duchy of Karameikos was created in 1987.