The present Tau Mining World of T'ros was originally an Imperial Mining World called Taros. It became a Tau Third Sphere Expansion colony following the Tau Empire's exploitation of the Imperium of Man's distraction with the onset of the 13th Black Crusade when large numbers of Imperial forces were diverted from the Eastern Fringes of the Segmentum Ultima to the defence of Cadia and the Imperial space surrounding the Eye of Terror from the Forces of Chaos. This allowed the Tau to win the Taros Campaign in 998.M41 for control of the planet from an Imperial force sent to take back the world. The capital of the arid planet is the city of Tarokeen. T'ros is today mainly inhabited by Gue'vesa (humans loyal to the Tau Empire) who were formerly citizens of the Imperium but became turncoats because