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The Grand Duchy of Yustona is one of three crownlands of the Apostolic Kingdom of Urcea. Since the Golden Bull of 1098, the Grand Duchy and associated Grand Ducal title have been one of the two definitive integral parts of the Urcean Crown, with the other being the Archduchy of Urceopolis. It is the third largest subdivision of Urcea by area and the second largest by population.

Economy
As of 2014-15, the Grand Duchy's total GDP was calculated to be $4,463,580,990,726, with approximately a $40,911 GDP PC.

Government
The Grand Duchy of Yustona functions using a parliamentary model rather than the more common federal presidential model in use by the provinces of Urcea. The Royal Parliament of Yustona functions as the primary government for the Grand Duchy. Upon advice of the Chancellor and Temporary President, the Apostolic King of Urcea appoints a Governor-General for the Grand Duchy. The Governor-General appointed for Yustona is typically of the same party as that of the Chancellor and Temporary President, giving the Governor-General something resembling a democratic mandate, unlike the appointment process for the Archduchy of Urceopolis. Consequently, the Governor-General of Yustona exercises some executive powers and serves as the Apostolic King's representative for constitutional functions. The government of the Grand Duchy is similar to the Government of Urcea, with the Governor-General serving as an analogue for the Procurator, albeit less powerful, and the Archducal Chancellor filling the role of head of government and leader of Parliament. The Royal Parliament and Grand Ducal government is based in The Hermitage, the official residence of the Apostolic King of Urcea in the Grand Duchy.