Luxembourg is the capital of what country?

The city of Luxembourg is the capital of the Grand Duchy of Luxembourg.

Luxembourg |ˈləksəmˌbərg; ˈloŏksəmˌboŏrk|a country in western Europe, between Belgium and Germany and northof France; pop. 462,000; capital, Luxembourg; official languages, Luxemburgish, French, and German.• the capital of the Grand Duchy of Luxembourg; pop. 76,000. It is the seat of the European Court of Justice.• a province in southeastern Belgium; capital, Arlon.