The Pupilla oculi by John de Burgo contained in CCCC MS 255 is mainly derived from Oculus sacerdotis by William of Paull (or Pagula) (fl. early fourteenth century) written in 1320-28, a manual of pastoral theology and advice, intended for parish priests. The Pupilla oculi was probably written c. 1380-85, when for part of that time John de Burgo (d. after 1398) was Chancellor of the University of Cambridge. It instructs on basic theology and confessional practice.