Johann Georg Barthel (1737-1805)
Gotha Illuminati Research Base (here and here).
Order name: “Bunder”
(1737 Neuwied – 1805 Neuwied) Protestant – Merchant in Neuwied. (1783) Member of the local lodge “Caroline zu den drei Pfauen,” Apprentice Degree.
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“Caroline zu den drei Pfauen” was an important lodge for the Illuminati. It was founded by Adolf Knigge. Monika Neugebauer-Wölk, Reichsjustiz und Aufklärung: Das Reichskammergericht im Netzwerk der Illuminaten (1992), p. 62:
The only known case so far of a Reichskammergericht (Imperial Chamber Court) process that directly connects to Illuminatism without relying on objective parallels in their goals is the case of Prince Friedrich Karl of Wied-Neuwied from 1792 to 1794. The sources directly refer to the Illuminati network that influenced the decision. According to Manfred Agethen, Neuwied was the strongest center of Illuminism outside of Bavaria. During his intensive collaboration with [Franz Dietrich von] Ditfurth in June 1782, Knigge established the Illuminati Lodge “Caroline zu den drei Pfauen” and a Minerva Church in Neuwied, resulting in strong personal connections. Ditfurth was friends with the prince’s personal physician, Johann Georg Wendelstadt (Eucharius), who later became the chamber physician in Wetzlar. He also ensured that Balthasar Ockel (Hercules), a practitioner from Wetzlar, obtained a council position in Neuwied. Prince Friedrich Alexander himself was an Illuminatus. In April 1783, the Neuwied Lodge joined the Eclectic Alliance (Eklektischer Bund).