Cestulus is the second planet in the Davien system, United Empire of Earth (UEE). Despite being initially considered a poor candidate for terraforming, Cestulus became a major shipping hub after first contact with the Banu in 2438. The city of Jata was the site of a series of bombings in 2546. The bombings, known as the Atrocity at Jata, were one of the catalysts that led the United Planets of Earth (UPE) to adopt Ivar Messer'sPrime Citizen plan. After the end of the Messer Era (2546-2792), historian Sydney Kamarck uncovered evidence that linked the attack to Messar allies Adam Corr and Cyrus Ishitaka, allegedly to facilitate Messer’s political ascent.