Black Gate is a strategic fortress in the province of Morrowind, located just southwest of Mournhold. Black Gate was a stronghold utilized during the time of the Tribunal, most notably during the Four-Score War. In 1E 2920, Black Gate was besieged by the Second Empire, around the 23rd of Sun's Height, amidst the negotiations after the war between the Crown Prince Juilek Cyrodiil and Vivec. The Prince made no plans to attack Black Gate. It was instead the brainchild of his father, Emperor Reman Cyrodiil III, and the Akaviri Potentate, Versidue-Shaie. Regardless, the negotiations had continued at the settlement of Ald Lambasi.
At one point in time, Black Gate had fallen into disrepair and ruin. The Dwarven artifact known as the Hammer of Gharen was last known to be located in the depths of Black Gate. King Casik of Ebonheart had the Anvil of Mithas in his possession, and sought out the Hammer. The king tasked the Eternal Champion with delving into Black Gate to retrieve the Hammer. With it, King Casik was able to use the two artifacts to craft the finest armor and weapons in the realm. In return, he revealed the location of the final piece of the Staff of Chaos, in the Dwarven Mines of Dagoth-Ur.