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|Guild Master Gallus Desidenius|
|Guild Master Gallus Desidenius as a ghost|
|Next Ruler||Mercer Frey|
Gallus Desidenius was an Imperial thief who became Guild Master of the Thieves Guild in Skyrim during the Fourth Era. He purportedly maintained strong ties with many influential families in Skyrim, which allowed the Guild to operate relatively safely. He was also a member of the Nightingale Trinity, along with Karliah, with whom he had a romantic relationship, and Mercer Frey. The three of them swore an oath to Nocturnal to protect the Skeleton Key, which holds the Ebonmere portal open at the Twilight Sepulcher. Gallus was the author of The Nightingales.
Over time, Gallus became suspicious of Mercer's behavior. Mercer, in turn, became aware of Gallus' scrutiny. Though he was unable to find hard proof, Gallus became convinced that Mercer was responsible for desecrating the Twilight Sepulcher and stealing the Skeleton Key. Before he could dig any further, Mercer arranged a meeting, where he betrayed and murdered Gallus. Gallus' spirit became the last of the Nightingale Sentinels and defended the Sepulcher alone for about 25 years.
- For game-specific information, see the Skyrim article.