"The main purpose of this Buddhist Sutra is to protect the country, while the purpose of the Daoist seals is the same. This religious syncretism can be explained by the political uncertainty prevailing in Sinkiang at the time. The specific commissioners of the production of such MSS for this purpose could have been Zhang Yichao, a local magnate who expelled the Tibetans from the area in 847, and ruled for nearly all of the 2nd half of the 9th c., or the Cao family who were established as Chinese Imperial Commissioners in the 10th and 11th centuries...." : Cf.: MSS. 2414 at http://www.schoyencollection.com/china.html.