The paper is a contribution to a discussion on the dating of Eunapius’ Vitae Sophistarum. Arguments are put forward that Eunapius’ remark on the necrolatry of the monks of Canopus reflects the establishment of a cult of Saints Cyrus and John. Since this event took place when the Church of Alexandria was headed by Cyril, we may consider the beginning of his archbishopric (October 18, 412 CE) as a reliable terminus post quem for the publication of this text.