On Tuesday 29 November Cathrien Hoijinck (Radboud University) presented her dissertation project about the Córdoba Calendar in the project seminar. The 10th century Córdoba Calendar contains various Coptic elements and Hoijinck suspects that next to a Damascene and Bagdadi prototype there might have been an Egyptian source, perhaps the calendar that was used for the thirteenth-century Long Calendar. In her project, she raises interesting questions about the use of calendars for showcasing erudition and for expressing community boundaries, and for the study of calendars as a potential but problematic source for religious practices.