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Xu Guangqi (1562–1633), a scholar and official, was a native of Shanghai. He came into contact with Christianity in 1596, later met the Jesuit missionaries Matteo Ricci and João da Rocha in Nanjing, and was baptized in 1603 under the name Paul. After receiving a jin shi degree in 1604, Xu became a bachelor in the Hanlin Academy. From 1604 to 1607 he worked continuously with Ricci, translating works on mathematics, hydraulics, astronomy, and geography, among them Euclid’s Elements, entitled Ji he yuan ben. In 1628 Xu was ...