The Great Anti-Buddhist Persecution initiated by Tang Emperor Wuzong reached its height in the year 845 AD. Among its purposes were to appropriate war funds and to cleanse China of foreign influences. As such, the persecution was directed not only towards Buddhism but also towards other foreign religions, such as Zoroastrianism, Nestorian Christianity and Manichaeism. Only the native Chinese ideologies of Confucianism and Taoism survived the upheaval relatively unaffected.
Emperor Wuzong's reasons for persecuting the Buddhist organisations and temples throughout China were economic, social, and religious.
An imperial edict of 845 stated the case against Buddhism as follows:
Buddhist monasteries daily grew higher. Men’s strength was used up in work with plaster and wood. Men’s gain was taken up in ornaments of gold and precious stones. Imperial and family relationships were forsaken for obedience to the fees of the priests. The marital relationship was opposed by the ascetic restraints. Destructive of law, injurious to mankind, nothing is worse than this way (Tao). Moreover, if one man does not plough, others feel hunger, if one woman does not tend the silk worms, others go cold. Now in the Empire there are monks and nuns innumerable. All depend on others to plough that they may eat, on others to raise silk that they may be clad. Monasteries and Refuges (Homes of ascetics, in Sanskrit) are beyond compute.
beautifully ornamented; they take for themselves palaces as a dwelling.... We will repress this long standing pestilence to its roots ... In all the Empire more than four thousand six hundred monasteries are destroyed, two hundred and sixty thousand five hundred monks and nuns are returning to the world, both (men and women) to be received as tax paying householders. Refuges and hermitages which are destroyed number more than forty thousand. We are resuming fertile land of the first grade, several tens of millions of Ch’ing ( 1 ching is 15.13 acres). We are receiving back as tax paying householders, male and female, one hundred and fifty thousand serfs. The aliens who hold jurisdiction over the monks and nuns show clearly that this is a foreign religion.
Ta Ch’in (Syrian) and Muh-hu-fo (Zoroastrian) monks to the number of more than three thousand are compelled to return to the world, lest they confuse the customs of China. With simplified and regulated government we will achieve a unification of our manners, that in future all our youth may together return to the royal culture. We are now beginning this reformation; how long it will take we do not know.