Consuetudinary (book)

A consuetudinary (Med. Lat. consuetudinarius) is the name given to a ritual book containing the consuetudines—forms and ceremonies—used in the service of a particular monastery, religious order, or cathedral. Often, over long periods of time, religious orders would develop unique liturgical approaches and such would be reflected in the written consuetudinary.

Notable examples of consuetudinary books include:

Mabillon's Vetera analecta
d'Achery's Spicilegium
Herrgott's Vetus disciplina monastica
Martène's De antiquis monachorum ritibus.