A synagogue or a prayer room was present at least since the time around 1700. Initially, such a prayer room was established in a house belonging to Barthel Hunefeldt. Then a prayer room could be established in the small castle (Eisenach life). Shortly before 1716 a new synagogue was built. From this year a document is preserved, in which is reported about closer circumstances to the building of the house of worship: The lords of Rosenbach would have given the timber for the construction. The building itself, however, was built on princely Saxony-Eisenach land.