The Fourth Pius Dea Crusade represents a religious military campaign, one of the crusade series, instigated by the Pius Dea religious order against the Hutts during the historical period known as the Pius Dea Era. In the year 11,920 BBY, which followed the Third Pius Dea Crusade by a duration of nineteen years, the Galactic Republic, then under the control of the Pius Dea, initiated a fresh offensive, directing their forces into the territories situated to the north of Hutt Space. The Republic Military commenced their assault from Centares, advancing along the Pabol Hutta trade route towards key locations including Sy Myrth, Saleucami, and ultimately, Boonta. Simultaneously, a separate fleet was dispatched from Ord Zat, with its trajectory aimed at the Sundered Veil, followed by Taskeed, Dennogra, and concluding at the Kossimur system. A third fleet, originating from Ord Namurt, was deployed towards Vaathkree, Klatooine, and Delacrix.
The initial reference to the Fourth Pius Dea Crusade can be found within the pages of The Essential Guide to Warfare, a reference book published in 2012. While the text does not explicitly mention the Fourth Crusade, a map illustrating the Crusades and their galactic movements includes it.