Giulio Alenio (often spelled Giulio Aleni; Chinese: 艾儒略; 1582 – June 10, 1649) was an Italian Jesuit missionary and scholar. He was born at Brescia, in Italy, and died at Yanping, China. He became a member of the Society of Jesus in 1600, and was distinguished for his knowledge of mathematics and theology.
In 1610, he was sent as a missionary to China. While waiting at Macau for a favorable opportunity to enter the country he taught mathematics to local scholars and published his "Observation sur l'éclipse de lune du 8 Novembre 1612, faite a Macao" (Mémoires de l'Acad. des Sciences, VII, 706.)
He adopted the dress and manners of the country, was the first Christian missionary in Jiangxi, and built several churches in Fujian. One of his converts, a scholar name Li Jiubiao, recorded Aleni's responses to the questions and speculations of his parishioners and compiled them into a journal.
He published works in Chinese on a variety of topics. His cosmography, Wanwu Zhenyuan (The True Origin of the Ten-thousand Things), was translated into Manchu during the reign of Kang-he as ᡨᡠᠮᡝᠨ
ᠵᠠᡴᠠᡳ
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ᠰᡝᡤᡳᠶᡝᠨ Wylie: Tumen chakai unengki segiyen, Möllendorff: Tumen jakai unengki segiyen. A copy was sent from Beijing to Paris in 1789. He completed the work of earlier Jesuit scholars to produce the Zhifang waiji, China's first global geography. Among his most important religious works are a controversial treatise on the Catholic Faith, in which are refuted what he saw as the principal errors of the Chinese; and The Life of God, the Saviour, from the Four Gospels (Peking, 1635–1637, 8 vols.; often reprinted, e.g. in 1887 in 3 vols) and used even by Protestant missionaries.