1525 – 24 October 1544), was a slater from Antwerp in the Duchy of Brabant who became the leader of a radical Protestant faction named Loists (Loïsten in Dutch) after him.
In a letter he wrote immediately afterwards, Luther warned the Protestant community at Antwerp against him (and "blustering and noisy spirits" in general) by summarizing Pruystinck's doctrines as: every man possesses faith and the Holy Spirit, where the first is the desire to treat one's neighbor as oneself and the second is human reason and intelligence; all souls enjoy eternal life; only the flesh and not the spirit suffers hell; no sin has been committed when not acting on an evil thought and small children cannot sin.
[3] These doctrines have been compared to those of the much older Brethren of the Free Spirit and Beghards and the 15th-century Homines Intelligentiae of the Low Countries,[2][3][4] and Pruystinck's movement was a form of Panentheism.
[2] The notion of radicalism was fueled by their rejection of religious marriage, lent, praying and other basic church regulations.
In September and October of that year Dominicus van Oucle committed suicide in prison and Hérault and some other leaders were decapitated.