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Bacon's optic studies, from Opus Majus

The Opus Majus (Latin for "Greater Work") is the most important work of Roger Bacon. It was written in Medieval Latin, at the request of Pope Clement IV, to explain the work that Bacon had undertaken. The 840-page treatise ranges over all aspects of natural science, from grammar and logic to mathematics, physics, and philosophy. Bacon sent his work to the Pope in 1267, accompanied by a letter of dedication which was found by F. A. Gasquet in the Vatican Library and published in 1897. It was followed later the same year by a smaller second work, his Opus Minus, which was intended as an abstract or summary of the longer work, followed shortly by a third work, Opus Tertium, as a preliminary introduction to the other two.

The Opus Majus is divided into seven parts:

An incomplete version of Bacon's Opus Majus was published by William Bowyer in London in 1733. It was edited by Samuel Jebb from a manuscript at Trinity College, Cambridge which omitted the seventh part.

As a recent paper emphasizes, this major work cannot be usefully read exclusively in the context of the history of science and philosophy while forgetting to consider Bacon's religious commitment to the Franciscan Order. "His Opus maius was a plea for reform addressed to the supreme spiritual head of the Christian faith, written against a background of apocalyptic expectation and informed by the driving concerns of the friars. It was designed to improve training for missionaries and to provide new skills to be employed in the defence of the Christian world against the enmity of non-Christians and of the Antichrist".[3]


  1. ^ David Ewing Duncan, The Calendar, 2011, pp. 3–5.
  2. ^ Clulee, Nicholas H.; Vickers, Brian (1984). "At the crossroads of magic and science: John Dee's Archemastrie": 59. doi:10.1017/CBO9780511572999.003. 
  3. ^ (p. 692) Power, Amanda. (2006). "A Mirror for Every Age: The Reputation of Roger Bacon". The English Historical Review. 121 (492): 657–692. doi:10.1093/ehr/cel102. Retrieved 2007-07-12. 


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