Johannes Bredenburg (1643–1691) was a Rotterdam wine merchant and weaver[1] who was a member of the Collegiants.
The philosopher Spinoza had joined the Collegiants and his ideas became the source of a division in the membership so that they broke into two parties.
The Spinozist party was led by Bredenburg and the opponents by Frans Kuyper.
[1] His rebuttal apparently explained Spinoza's philosophy so clearly that others accused him of disseminating Spinozism.
In the end, he was dissatisfied by his own rebuttal, refuted it, and came to adopt Spinoza's ideas.