During this time, the T'au's legends tell of the first appearance of the Ethereals at the city of Fio'taun. They have developed very rapidly as a space-faring species.Д®arlier in their history, the T'au were a culture built upon warring tribes. What is known is that only 6,000 standard years ago, in the 35th Millennium, an Adeptus Mechanicus Explorator fleet had discovered the T'au homeworld of T'au and determined that its population of sentient xenos were a primitive people at the Stone Age level of development who had only just mastered fire. The exact date of the founding of the T'au Empire in the Imperial Calendar is unclear, however the way in which the T'au were united as a species is a well-known tale. 10.1.3 XV8 Crisis Battlesuit Shas'vre BodyguardДЄn astrographical representation of the T'au Empire.Unlike other young intelligent races of the galaxy, the T'au have made remarkable leaps in technology and now represent a real threat to Imperial domination in their region of the galaxy. The T'au are a relatively young species (it has been only 6,000 Terran years since Imperial Inquisitors first noted that the T'au had only just mastered fire and the wheel), and they have evolved rapidly over the past few millennia. These people are known as Gue'vesa in the T'au Lexicon and they are considered amongst the most vile of Traitors and Heretics within the Imperium of Man.

However, there are now several Human T'au Septs derived from conquered Imperial Humans or Humans who voluntarily joined the T'au Empire because they were impressed by the concept of the Greater Good. The T'au are the central figures of the T'au Empire, an interstellar polity which is composed of several different intelligent species, primarily the Kroot of Pech, the Vespids of the world of Vespid and the nomadic Nicassar.

The T'au's central motivating ideal is that everyone in their empire regardless of their species of origin will work for the collective betterment of everyone else, an almost mystical philosophy they call the Greater Good. T'au society is divided into a number of castes, each responsible for managing a specific aspect of their society. However, if their peaceful overtures are refused, the T'au may well decide to conquer a planet and add it to their growing interstellar empire for the Greater Good, searing the flesh from the bones of anyone who stands against their benign intentions. The T'au claim to be a peaceful species when possible, asking if others will join their cause voluntarily instead of fighting against them. They are fighting to expand their interstellar empire and extend a philosophical concept they call the ' Greater Good' ( Tau'va in the T'au Lexicon) to all the intelligent species of the galaxy. The T'au ( Imperial binomial classification: Tau tau), also spelled Tau in older records and pronounced 'TOW,' are a young, humanoid and technologically-advanced intelligent species native to the Eastern Fringes of the Milky Way Galaxy.

The sigil of the sept of T'au, the T'au homeworld, often used as a symbol for the entire T'au Empire.

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