Johannes Duijkerius (1661/1662-1702) has attracted some scholarly attention as a minor Spinozist. This assessment may well be misconceived. He is best or rather almost exclusively known as the author of the novel Het Leven van Philopater (The Life of Philopater), a theological roman à clef published anonymously in 1691. A second, and likewise anonymous Vervolg van ’t Leven van Philopater (Sequel to the Life of Philopater, 1697), has often been ascribed to him as well. Although Duijkerius emphatically denied authorship of this sequel, a plainly Spinozistic work, the suspicion of heterodoxy stuck. A closer look at Duijkerius’s career supports the contention that Vervolg was indeed not his, and produces a much richer, more intriguing picture of a minor intellectual living in interesting times. Instead of a frustrated candidate for the ministry and reluctant ‘radical,’ Duijkerius proves to have been an ambitious schoolmaster in Amsterdam, who fully participated in the lively debates of the Early Enlightenment but did not transgress the boundaries of Reformed orthodoxy. His life and works provide a perfect example of the entanglement of religious and intellectual history in the early modern period.