truce between Peter and Bernard of Clairvaux must be seen as superficial in light of recent scholarship detailing the repressiveness of Bernard's Cistercians toward the Cluniac orders. Peter the Venerable died at Cluny on 25 December 1156. His works are edited in Patrologia Latina vol. 189. Contribution to Muslim–Christian relations Despite his active life and important role in European history, Peter's greatest achievement is his contribution to the reappraisal of the Church's relations with the religion of Islam. A proponent of studying Islam based upon its own sources, he commissioned a comprehensive translation of Islamic source material, and in 1142 he traveled to Spain where he met his translators. One scholar has described this as a "momentous event in the intellectual history of Europe." The Arabic manuscripts which Peter had translated may have been obtained in Toledo, which was an important centre for translation from the Arabic. However, Peter appears to have met his team of translators further north, possibly in La Rioja, where he is known to have visited the Cluniac monastery of Santa María la Real of Nájera. The project translated a number of texts relating to Islam (known collectively as the "corpus toletanum"). They include the Apology of al-Kindi; and most importantly the first-ever translation into Latin of the Arabic Qur'an (the "Lex Mahumet pseudoprophete") for which Robert of Ketton was the main translator. Peter of Toledo is credited for planning and annotating the collection, and Peter of Poitiers (Peter the Venerable's secretary) helped to polish the final Latin version. The team also included Robert of Ketton's friend Herman of Carinthia and a Muslim called Mohammed. The translation was completed in either June or July 1143, in what has been described as "a landmark in Islamic Studies. With this translation, the West had for the first time an instrument for the serious study of Islam." Peter used the newly translated material in his own writings on Islam, of which the most important are the Summa totius heresis Saracenorum (The Summary of the Entire Heresy of the Saracens) and the Liber contra sectam sive heresim Saracenorum (The Refutation of the Sect or Heresy of the Saracens). In these works Peter portrays Islam as a Christian heresy that approaches paganism, and he explains to St. Bernard that his goal is "ut morem illum patrum sequerer, quo nullam unquam suorum temporum vel levissimam (ut sic dicam) haeresim silendo praeterirent, quin