ABSTRACTThis paper examines two seventeenth-century works written by Adam Boreel and Galenus Abrahamsz, two most famous scholars among the Amsterdam Collegiants who advocated ideas in favour of religious toleration. This study is divided in three main parts. Firstly, I give historical information on the circumstances that led Galenus Abrahamsz to write his work. Secondly, I make a thorough comparison between Abrahamsz’s work and Boreel’s treatise, arguing that the latter exerted great influence on the former. However, despite major parallels, I also (...) show that there are deep differences in their works. Thirdly, I argue that both Boreel and Abrahamsz pursued the same aim: to establish religious toleration among Christians. In the conclusion, I suggest that we should not regard Abrahamsz as a Collegiant himself, but only as a sympathizer of Collegiant ideas. I also suggest the significance of further studies on the Collegiants, their practices, and their ideas. (shrink)