Ping-Ti Ho wrote: ““Ahead of concluding the area over the T’ang, I wish to look at some readily available figures. Between T’ang T’ai-tsung’s accession in 617 plus the outbreak on the An Lu-shan rebellion in 755, a span of 138 yrs, the mixture number of such steppe people given that the Turks as well as the nineteen Turkish T’ieh-Ie t