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The precise period of Roger is not definitely settled by the unanimous agreement of modern historians, but in the "Epilogus" of the "Glosulae Quatuor Magistrorum" it is said that Roger's "Chirurgia" was "in lucem et ordinem redactum" by Guido Arietinus, in the year of our Lord 1230. This date, while perhaps not unquestionable, is also adopted by De Renzi, the Italian historian of Medicine.
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