Richard Gottheil, Jewish Encyclopedia (1901)
“ The first mention of Jews in Aach is found in a document of the year 1518, in which the Jews of Geisingen are accused of having murdered a Christian child. In another document, of the year 1522, reference is made to a debt due to a Jewish tradesman of Aach from an inhabitant of Beuren. In the archives of Carlsruhe there are three documents dealing especially with the Jews of Aach during the last half of the sixteenth century. Every ten years the Jews of Nellenburg were required to renew their permits of residence in the landgraviate. ”
