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Gratian compiled his Decretum, jurists collected papal decretals.
These decretals contained the decisions of the papal curia for cases that
had been appealed to Rome. These collections began as appendices
attached to manuscripts of the Decretum. By the fourth quarter of the
twelfth century, they were organized into five books
and arranged according the subject
matter. This format became standard for the codification of decretals
Bernardus Papiensis (Bernard of Pavia)
Iudex, Iudicium, clerus, connubia, crimen (Judge, Courts, Clergy, Marriage, Criminal Law)
Compilatio tertia Pope Innocent III (1210)
Compilatio quinta, Pope Honorius III (1216-1227) commissioned Tancred of Bologna 1225 - First canonical collection promulgated by a pope.
Compilationes antiquae (prima-quinta 1-5)
Decretales of Pope Gregory IX (Liber Extra = X) (1234) St. Raymund of Peņafort