"Ateret Zekenim is a work of historical research into the lives of several well-known medieval halakhists from France, Germany, and Spain. The primary focus of the book is biographical, and it attempts to resolve difficult questions that have puzzled the scholarly community for many years. Its author seeks to rely on the writings of his predecessors, but he first substantiates that these foundations were properly laid and that he is not adding to an edifice that is destined to collapse. Thus, for example, the author re-examines the story of Rabbi Asher b. Yeḥiel (Rosh)'s migration from Germany to Spain in the early 14th century, a migration that had a dramatic impact on the culture of Sephardi and Ashkenazi Jewry alike. Is the scholarly consensus - according to which Rosh meticulously planned his flight to distant Toledo, in an entirely different cultural realm, over the course of two decades - correct? After methodical examination of the sources, a very different story emerges. Rosh, and with him the Ashkenazi halakhic tradition, moved from Germany to Spain at the last moment, when there were no other options."--Publisher's description