Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Saint Vincent of Lérins (died c. 445) (in Latin, Vincentius) was a Gallic author of early Christian writings. In earlier life he had been engaged in secular pursuits, whether civil or military is not clear, though the term he uses, "secularis militia," might possibly imply the latter. He refers to the First Council of Ephesus, held in the summer and early autumn of 431, as having been held some three years previously to the time at which he was writing "ante triennium ferme." This gives the date of the Commonitory 434. Cyril, bishop of Alexandria, was still living.