The Assertor, a Galactic Empire vessel, functioned as the flagship of its Assertor-class Star Dreadnought designation within the Imperial Navy. This starship, along with its counterpart, the Wrath, began construction at Kuat Drive Yards' Kuat shipyards prior to the Battle of Yavin in 0 BBY. Sometime following that pivotal battle, the Assertor was utilized in a substantial battle group, believed to encompass numerous vessels, positioned along the boundary separating the Mid Rim and the Outer Rim Territories. Its purpose was to bolster actions against the Alliance to Restore the Republic throughout the duration of the Galactic Civil War.
Fantasy Flight Games' Lead by Example, a sourcebook for the Star Wars: Age of Rebellion roleplaying game system, released in 2016, included a reference to the Assertor.