Rabbi Abraham ben Alexander of Cologne (Axelrad of Cologne), (13th century, c. 1240). A student of Rabbi Eleazar ben Yehuda of Worms. He settled in Spain, where he likely studied under Rabbi Ezra Solomon ben Abraham Adret. Keter Shem Tov. A treatise on the Name יהו״ה, in which the author attempts to synthesize Ashkenazi Hasidism with Provençal and Spanish Kabbalistic traditions.