Patriarch of the local Christians did have a religious colloquium there was much discussion of the scriptures but no mention of the Quran, "a possible indication that the Quran was not yet in circulation." The Christians reported the Emir was accompanied by "learned Jews", that the immigrants "accepted the Torah just as the Jews and Samaritans", though none of the sources described the immigrants as Jews. Wansbrough's students Crone and Cook co-authored a book called Hagarism: The Making of the Islamic World (1977). Crone, Wansbrough, and Nevo argue that all the primary sources which exist are from 150–300 years after the events which they describe, and thus are chronologically far removed from those events. Support for the traditional Islamic narrative Not all scholars question the sacred history of the Quran. Emran El-Badawi writes, "the opening chapters of Fred Donner's Narratives of Islamic Origins: The Beginnings of Islamic Historical Writing claims to refute the theoretical and methodological flaws of the skeptical school and instead dates the composition of the Quran, as a closed canon, to an Arabian context of early believers preceding ... the first civil war in 656." The datings in 2015 of the Birmingham Quran manuscript lead Joseph E. B. Lumbard, a convert to Islam and associate professor of Quranic studies at the College of Islamic Studies at Hamad Bin Khalifa University in Qatar, to comment: These recent empirical findings are of fundamental importance. They establish that as regards the broad outlines of the history of the compilation and codification of the Quranic text, the classical Islamic sources are far more reliable than had hitherto been assumed. Such findings thus render the vast majority of Western revisionist theories regarding the historical origins of the Quran untenable. However, on Birmingham manuscript, David Thomas pointed out that the radiocarbon testing found the death date of the animal whose skin made up the Quran, not the date when the Quran was written. Since blank parchment was often stored for years after being produced, he said the Quran could have been written as late as 650–655, during the Quranic codification under Uthman. And later, Marijn van Putten, who has published work on idiosyncratic orthography common to all early manuscripts of the Uthmanic text, stated that it can not be a pre-Uthmanic copy, despite its early radiocarbon dating. In dating of the text, the Dome of the Rock inscriptions, which have been known for