The upshot of it was that in 771 B.C. the Emperor was killed by the Tartars in battle, and it was only by securing the military assistance of the semi-Tartar Warden of the Marches that the imperial dynasty was saved. As it was, the Emperor's capital was permanently moved east from the immediate neighbourhood of what we call Si-ngan Fu in Shen Si province to the immediate neighbourhood of Ho-nan Fu in the modern Ho Nan province; and as a reward for his services the Warden was granted nearly the whole of the original imperial patrimony west of the Yellow River bend and on both sides of the Wei Valley. This was also in the year 771 B.C., and this is really one of the great pivot-points in Chinese history, of equal weight with the almost contemporaneous founding of Rome, and the gradual substitution of a Roman centre for a Greek centre in the development and civilization of the Far West.