The paper studies the historical background for the ‘idealist’ reading of Spinoza usually traced back to British and German Idealism. Here, I follow this history further back than and focus on one earlier idealist reading, indeed perhaps the mother of them all. It can be found in the _Elucidarius cabalisticus, sive reconditae Hebraeorum philosophiae brevis et succincta recensio_ by Johann Georg Wachter, a kabbalist interpretation of Spinoza published in 1706. I am principally interested in the importance that Wachter’s book may (...) have had for German philosophy in the second half of the eighteenth century. Focusing on Moses Mendelssohn’s _Philosophische Gespräche_ of 1755, I argue that, via Mendelssohn, the Elucidarius cabalisticus is perhaps the earliest possible source of the idealist reading of Spinoza that dominated the German _Spinozabild_ from throughout the _Pantheismusstreit_ up to the second edition of Herder’s 1800 _Gott: Einige Gespräche_, culminating with Hegel’s ‘acosmist’ reading of Spinoza in the 1825–26 lectures on the history of philosophy. (shrink)