Castle Dour

Castle Dour is the current headquarters of the empire and the temporary home of King Gronar Iron-Hand, (until he's recaptured the imperial city, reconquered cyrodiil and taken back he's imperial palace). It is a large castle that lies within the city of solitude in the province of skyrim, and it is here that King Gronar Iron-Hand rules over What remains of The Empire after The Great War and plots His Revenge Against The Thalmor and also prepares for the eventual second Great War

History
it is unknown how old the castle is and how long its stood in skyrim, only thing that is certain is that after losing the Great War with the thalmor King Gronar Iron-Hand Fled to skyrim with his troops and turned the Castle into his own decorating it with banners and placing his mark on the fortress

Reign of King Gronar Iron-Hand
Some time after His Loss in The Great War, King Gronar Iron-Hand took residence in Solitude. He would make this castle as his primary headquarters and residence. King Gronar Iron-Hand would rule in the palace throughout the 4th Era, having loyal subjects, including his most trusted agent, The Khajiit Known as Inigo.

The castle came to serve as King Gronar Iron-Hand 's personal residence and from time to time, he often held political meetings there and held nordic parties with mead, bards and drinking. On one occasion, a political meeting he had with his advisors was cut short by The Arrival of Agnar Aretino The Lone Warrior. King Gronar Iron-Hand also conversed with Proventus avennici and Irileth there about the overstretching efforts to defeat the Stormcloak Rebellion.