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This Letter, i.e. for the first time, proves that a general invariantvelocity is originated from the principle of special relativity, namely,discovers the origin of the general invariant velocity, and when the generalinvariant velocity is taken as the invariant light velocity in currenttheories, we get the corresponding special theory of relativity. Further, thisLetter deduces triple special theories of relativity in cosmology, and cancelsthe invariant presumption of light velocity, it is proved that there exists ageneral constant velocity K determined by the experiments in cosmology, for K >0, = 0 and < 0, they correspond to three kinds of possible relativistictheories in which the special theory of relativity is naturally contained forthe special case of K > 0, and this Letter gives a prediction that, for K < 0,there is another likely case satisfying the principle of special relativity forsome special physical systems in cosmology, in which the relativistic effectsobserved would be that the moving body would be lengthened, moving clock wouldbe quickened. And the point of K = 0 is a bifurcation point, through which itgives out three types of possible universes in the cosmology (or multiverse).When a kind of matter with the maximally invariant velocity that may besuperluminal or equal to light velocity is determined by experiments, then theinvariant velocity can be taken as one of the general invariant velocityachieved in this Letter, then all results of current physical theories areconsistent by utilizing this Letter's theory.

General Invariant Velocity Originated from Principle of Special Relativity and Triple Special Theories of Relativity