Mid 13th-century St. Albans is crucially important in the history of English illuminated manuscripts thanks primarily to the works of Matthew Paris, a monk of the abbey. Many manuscripts have been--probably wrongly--attributed to the abbey by comparison with Matthew's style and technique; this psalter is therefore important because its claim to be a St. Albans product (based on the calendar, litany, and early ownership by a St. Albans monk) is secure. Half-way down the right-hand column the list of martyrs in this litany begins with St. Alban, whose name is followed by a 'II', indicating that is to be invoked twice. Next come St. Amphibalus, the second most important saint at St. Albans. In the margin one line lower down a later owner has added St. Oswine, with a double invocation, the third major saint of St. Albans.