Johann George Schrepfer’s life story is clouded by his embellished and falsified tales of his necromancy and spiritualism. And both his followers and detractors also gave biased and incorrect accounts of their interactions with him.
Research:

Embroidery History Sampler, Part 2
34:22

Embroidery History Sampler, Part 1
36:00

SYMHC Classics: Paul Cuffe
30:49