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Ziost was a major city located on the planet of the same name. During the Great Galactic War, Cold War, and Galactic War, it functioned as the capital of the planet and of Imperial border space, earning it the nickname "Gateway to the Empire."

History
Ziost was constructed by the Sith sometime between the Great Hyperspace War and the Great Galactic War. Over the years, it grew into a major city, thus replacing the planet's former capital and becoming the primary Sith hub in the border regions of Imperial Space. While the new capital of the Sith Empire was now located on the jungle world of Dromund Kaas, the construction of the city restored some of the planet's former significance.

At some point, the headquarters of the Ministry of Logistics relocated to the metropolis, its minister setting up an office at the Orbital Command Center, which functioned as the planetary capitol.

The city also contained the empire's primary customs office and at least one hotel.

In 3640 BBY, SIS agent Theron Shan and Jedi Master Gnost-Dural visited the city during Operation End Game, where the latter, with the help of his friend Teff'ith, succeeded in stealing a black cipher from Minister Davidge's safe in the heavily guarded Orbital Command Center. With the cipher, the Galactic Republic could easily conduct counter=espionage against Imperial Intelligence.

In spite of the Republic's victory, Ziost continued to be a strategic city on the fringes.

Behind the scenes
The city first appeared in the 2012 novel The Old Republic: Annihilation, confirming that the Ziost continued to play a key role by the time of Star Wars: The Old Republic, even after the ancient capital was abandoned by Emperor Vitiate when he led the remaining Sith forces deep into the Outer Rim.

It is unknown when the empire ended up retaking the planet and constructing the city, but it is probable that such was done around the same time that it retook Korriban. If that were the case, the city would not have been built until after 3680 BBY, but it is also possible that the planet was forgotten about and absorbed by the new empire earlier.

By the time of Naga Sadow and earlier, when the Old Sith capital was relocated to Ziost, the planet's main city was a massive citadel, constructed by Ludo Kressh. With the lack of a Sith presence, it remained largely unpopulated. It is likely that the City of Ziost was built atop the ruins of the Sith Citadel.

The city was never officially given a proper name, referred to only as "Ziost" in the novel.

Appearances

 * The Old Republic: Annihilation - (First Appearance)
 * Star Wars: The Old Republic - (mentioned only)