Although CCCC MS 465 is frequently described as the Customary of the Benedictine Cathedral priory of Norwich, the content is that of the Ordinal rather than the Customary. An Ordinal contains directions for the liturgical services throughout the Church year. The dating of the main text is 1258-65, but the calendar of Norwich Cathedral Priory at the beginning of the book was added 1278-88. The pressmark of the priory is on the flyleaf, and an inscription recording it as the 'Ordinale fratris R. de Lok.'.