  Despite the bitter and extended controversy in which Regius engaged with Voetius and the university authorities, he was later appointed Rector of the University of Utrecht (a one-year honorary position) in 1649, and again in 1662. He published an amended, enlarged edition of the Fundamenta physices under the title Philosophia naturalis in 1654, and a third edition in 1661. A French translation appeared in 1687. He remained in Utrecht, except for a brief period when he was captured as a hostage by the French army in late 1673, and died there in 1679.