John Frederick, like his brother Albert, was made a member of the Fruitbearing Society by Prince Louis I of Anhalt-Köthen, before the start of their Grand Tour. Louis gave John Frederick the nickname der Entzündete ("the Inflamed") and the motto verderbet und erhält ("spoil and receive"). His emblem was "stubbles in the field, set on fire, half burned". He was member number 18.
In 1622, John Frederick and his brother Bernhard fought in the Battle of Wimpfen on the side of Baden. Three years later, his brother John Ernest the Younger promoted him to Colonel. Later that year, a power struggle between the brothers escalated for political reasons. It ended when John Frederick was arrested. He was later released. However, in 1627 he attempted to join the army of Tilly.He was caught, and again imprisoned by his brothers.
John Frederick was very interested in Alchemy all his life. On 16 October 1628, while still in prison, he confessed, in writing, to a pact with the devil. The next day, he was found dead in his cell. Speculations ranged from suicide to murder; neither was ever conclusively proven. A witch trial against him was never started.
References
Ronald Füssel: Die Hexenverfolgungen im Thüringer Raum = Veröffentlichungen des Arbeitskreises für historische Hexen- und Kriminalitätsforschung in Norddeutschland, vol. 2, DOBU, Hamburg, 2003, p.92 and p.247 ff
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