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Borri's family was one of good standing in Milan. He became a member of the Society of Jesus, 16 September 1601; in 1616 he was sent from Macau with the Jesuit priest Marquez, as one of the first missionaries to Đàng Trong (then called Cocincina, now part of central and southern Vietnam). He stayed at Hội An from 1618 until 1622, being known under the name of Bruno.
Borri's most important work Relatione della nuova missione delli P.P. della Compagnia di Gesù al Regno della Cocincina appeared in Rome in 1631 and was translated into French, Dutch, Latin, German and English. It was also inserted in Churchill's Collection of Voyages (1704), and in and Sprengel and Forster's Neue Beitrage zur Volkerund Länderkunde (1793). The work was considered one of the best sources of information concerning Cochinchina on account of its detailed description of the physical, political, and ecclesiastical conditions of the country.
Borri also made observations on the magnetic variation of the compass. According to Kircher (1641) he drew up the first chart for the Atlantic and Indian Oceans showing the spots where the magnetic needle makes the same angles with the meridian; if this is true, he should be regarded as the forerunner of Edmund Halley. Borrus gives the explanation to the chart in a manuscript that belongs to the Royal Academy at Lisbon. In another manuscript, now in Évora, Tratada da arte de navegar pelo Cristovao Bruno, which bears on the same subject, he makes suggestions, according to Allatius (1633), as to a new method for determining the longitude at sea and also concerning improvements in sea-charts. Philip II of Spain, desiring to understand the Borrus' nautical studies and inventions, once summoned him from Coimbra to Madrid. He also wrote Doctrina de Tribus Coelis, Aereo, Sydereo et Empeireo, and also some accounts of his travels for the Congregatio de Propaganda Fide.
- Olga Dror and K.W. Taylor, Views of Seventeenth-Century Vietnam: Christoforo Borri on Cochinchina and Samuel Baron on Tonkin (Ithaca: Cornell Southeast Asia Program Publications: 2006).
- Silk for Silver: Dutch-Vietnamese Relations, 1637-1700 - Page 252 Anh Tuấn Hoàng - 2007 " The Italian priest Christopher Borri, who lived in Hội An between 1618 and 1622, recorded this incident: ...
- This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Christopher Borrus". Catholic Encyclopedia. New York: Robert Appleton. Cites:
- Allatius, Apes Urbanae (Rome, 1633), 66;
- Kircher, Magnes sive de arte magneticâ (Rome, 1641), 502;
- De Visch, Bibliotheteca scriptorum Sacr. Ord. Cisterciensis (Cologne, 1656) 71;
- Backer-Sommervogel, Bibl. de la c. de J. (1890), I, 1821–22; VII, 1878;