At the end of the 17th century few Bible scholars doubted that Moses wrote the Torah, but in the late 18th century some liberal scholars began to question his authorship, and by the end of the 19th century some went as far as to claim that as a whole the work was of many more authors over many centuries from 1000 BC (the time of David) to 500 BC (the time of Ezra), and that the history it contained was often more polemical rather than strictly factual. By the first half of the 20th century Hermann Gunkel had drawn attention to mythic aspects, and Albrecht Alt, Martin Noth and the tradition history school argued that although its core traditions had genuinely ancient roots, the narratives were fictional framing devices and were not intended as history in the modern sense.