Taros (T'ros)

The present Tau mining world of T'ros was originally an Imperial mining world called Taros. It became a Tau Third Expansion Sphere Colony following the Tau Empire's exploitation of the Imperium of Man's distraction with the onset 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. The capital city 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 the Tau seemed to offer a better life.

Taros Campaign
The Taros Campaign pitched Imperial forces against the Taros Planetary Defence Force, the Tau, and their Gue'vesa and Kroot mercenary allies in a series of battles across the surface of the desert mining planet of Taros (T'ros). Prior to the campaign, the Imperial Planetary Governor Aulis, the head of the Taros planetary govenment, developed friendly trading relations with the Tau who desired Taros' strategic metals to build up their war machine. Ultimately the governor sought to defect to the Tau Empire with the support of much of the planetary population once his illegal trading with the xenos was discovered by a team sent by the Adeptus Administratum to determine if the planet's tithe of ore could be increased to meet the growing demands of the Imperial Guard for materiel to prepare for the expected 13th Black Crusade of Abaddon the Despoiler. When his treachery was unveiled, a full company of Avenging Sons Space Marines were dispatched to kill him, but they failed in their assignment after being intercepted by Tau bodyguards who had been secretly assigned to the world to protect the governor. Following the assassination attempt, the Tau officially annexed Taros while the Imperium gathered an army made up of several regiments of the Imperial Guard to recapture the planet. A large-scale invasion of the world followed, ending in the defeat of the 4621st Imperial Guard Army. This defeat is partially credited to the defection of a large percentage of the human population of Taros, including the Taros Planetary Defence Forces. Taros then became T'ros, a Sept of the Tau Empire's Third Sphere.