In Leiden the principal parish church, St. Peter, was from 1268 served by priests of the Utrecht bailiwick of the Teutonic Order. They were introduced there by count Floris V of Holland, with the special charge to perform the commemoration (memoria) of the soul of Floris' father. Douwe Faber explored in his dissertation what this has meant for the city of Leiden. Memoria turns out to be the main element in late medieval religion in Leiden.
Forms of memoria
The main forms of memoria in Leiden were founding and maintaining chantries for reading masses and prayers and engaging anniversaries for (in general) yearly commemoration of specified persons. Founders of chantries in St. Peters church wished to keep the presenting of chantry priests in their families, while the parish priests wanted to have this with the commandry, a latent cause for for disputation. Engaging anniversaries in St. Peter could be arranged directly with the commandry, scarsely documented, but was mainly done by mediation by lay authorities such as the curch wardens.