The Mytaranor Campaign is a war that the mercenary named Saponza alleged to have been a part of around 3 ABY. When looking for employment, he mentioned this campaign as part of his work history on the Undervine. Despite this, his listing didn't get any replies for more than a month. The mercenary expressed his frustration about this in the Smuggler's Guide, a book. The campaign's title was the same as that of the Mytaranor sector, which was situated in the Mid Rim.
The 2018 reference book Star Wars: Smuggler's Guide, penned by Daniel Wallace, was the first place the Mytaranor Campaign was brought up.