The advent of the Ming was initially devastating to Christianity: in his first year, the Hongwu Emperor declared the eighty-year-old Franciscan missions among the Yuan heterodox and illegal. The centuries-old Nestorian church also disappeared. During the later Ming a new wave of Christian missionaries arrived – particularly Jesuits – who employed new western science and technology in their arguments for conversion. They were educated in Chinese language and culture at St. Paul's College on Macau after its founding in 1579. The most influential was Matteo Ricci, whose "Map of the Myriad Countries of the World" upended traditional geography throughout East Asia, and whose work with the convert Xu Guangqi led to the first Chinese translation of Euclid's "Elements" in 1607. The discovery of a Nestorian stele at Xi'an in 1625 also permitted Christianity to be treated as an old and established faith, rather than as a new and dangerous cult. However, there were strong disagreements about the extent to which converts could continue to perform rituals to the emperor, Confucius, or their ancestors: Ricci had been very accommodating and an attempt by his successors to backtrack from this policy led to the Nanjing Incident of 1616, which exiled four Jesuits to Macau and forced the others out of public life for six years. A series of spectacular failures by the Chinese astronomers – including missing an eclipse easily computed by Xu Guangqi and Sabatino de Ursis – and a return by the Jesuits to presenting themselves as educated scholars in the Confucian mold restored their fortunes. However, by the end of the Ming the Dominicans had begun the Chinese Rites controversy in Rome that would eventually lead to a full ban of Christianity under the Qing dynasty.