Robert of Chester (Latin:Robertus Castrensis) was an EnglishArabist of the 12th century. He translated several historically important books fromArabic toLatin, such as:

• Book on the Composition of Alchemy (Liber de compositione alchemiae): translated in 1144, this was the first book onalchemy to become available in Europe^[1]
• Compendious Book on Calculation by Completion and Balancing (Liber algebrae et almucabola):al-Khwārizmī's book aboutalgebra, translated in 1145^[2]

In the 1140s Robert worked in Iberia, where the division of the region between Muslim and Christian rulers resulted in opportunities for interchange between the different cultures. However, by the end of the decade he had returned to England. Some sources identify him withRobert of Ketton (Latin:Robertus Ketenensis) who was also active as an Arabic-Latin translator in the 1140s.^[2]However,Ketton andChester, while both places in England, are a long way apart. Also, when in Iberia, Robert of Ketton was based in theKingdom of Navarre, whereas Robert of Chester is known to have worked inSegovia.

• Latin translations of the 12th century
• Louis Charles Karpinski

• Lo Bello, Anthony (22 April 2024). "Robert of Chester".The commentary of Al-Nayrizi on Book I of Euclid's Elements of geometry, with an introduction on the transmission of Euclid's Elements in the Middle Ages. Boston: Brill Academic. pp. 41–44.ISBN 978-0-391-04192-9.
• Charles Burnett, ‘Ketton, Robert of (fl. 1141–1157)’,Oxford Dictionary of National Biography,Oxford University Press, 2004. (This is, in effect, a double biography covering both Robert of Ketton and Robert of Chester.)

• [1], complete text online. Translation of Robert of Chester, or Robert of Ketton.

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