La Trobe University - Library: Medieval Music Database - Annual cycle of feasts of liturgical chant, liturgical polyphony and secular music of the late middle ages.

Princeps ecclesie pastor ovilis

anonymous hymn

Ivrea: Biblioteca Capitolare 115, fol. 29v-30 (1/1).

LEFFERTS, Peter M. The Motet in England in the Fourteenth Century, Ann Arbor: UMI Research Press, 1986, pp. 180, 239.