Robert of Chester

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Robert of Chester (Latin: Robertus Castrensis) was an English Arabist of the 12th century. He translated several historically important books from Arabic to Latin, such as:

In the 1140s Robert worked in Spain, where the division of the country 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 with Robert of Ketton (Latin: Robertus Ketenensis) who was also active as an Arabic-Latin translator in the 1140s.[2] However, Ketton and Chester, while both places in England, are a long way apart. Also, when in Spain, Robert of Ketton was based in the Kingdom of Navarre, whereas Robert of Chester is known to have worked in Segovia.

See also[edit]


  1. ^ The Arabic Origin of Liber de compositione alchimiae
  2. ^ a b Robert of Chester (1915). Algebra of al-Khowarizmi. Macmillan. Archived from the original on 30 December 2017. Retrieved 21 March 2009.


  • Lo Bello, Anthony. "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 0-391-04192-4.
  • 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.)

External links[edit]

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