The second major source of stability was the Central Asian aspect of their Manchu identity, which allowed them to appeal to Mongol, Tibetan and Uighur constituents. The ways of the Qing legitimization were different for the Chinese, Mongolian and Tibetan peoples. This contradicted traditional Chinese worldview requiring acculturation of "barbarians". Qing emperors, on the contrary, sought to prevent this in regard to Mongols and Tibetans. The Qing used the title of Emperor (Huangdi) in Chinese, while among Mongols the Qing monarch was referred to as Bogdo khan (sacred, great or wise khan - Mo. Bogd khaan), and referred to as Gong Ma in Tibet. The Qianlong Emperor propagated the image of himself as a Buddhist sage ruler, a patron of Tibetan Buddhism. In the Manchu language, the Qing monarch was alternately referred to as either Huwangdi (Emperor) or Khan with no special distinction between the two usages. The Kangxi Emperor also welcomed to his court Jesuit missionaries, who had first come to China under the Ming. Missionaries including Tomás Pereira, Martino Martini, Johann Adam Schall von Bell, Ferdinand Verbiest and Antoine Thomas held significant positions as military weapons experts, mathematicians, cartographers, astronomers and advisers to the emperor. The relationship of trust was however lost in the later Chinese Rites controversy.