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How did Justinian law influence medieval canon law?

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First Council of Nicaea — canon law Council of Nicaea in 325, depicted in a Byzantine fresco in the basilica of St. Nicholas in Demre, Turkey.

Justinian law, specifically the Corpus juris civilis (“Body of Civil Law”) compiled under Emperor Justinian I in the 6th century, played a foundational role in the development of medieval canon law.12

The influence occurred primarily through the following channels:

Transmission of Jurisprudence: Canon law served as a vital vehicle for transmitting Roman legal concepts into medieval Europe. As the study of law flourished at the University of Bologna in the 12th century, scholars rediscovered Justinian’s legal writings, including the Digesta and Institutiones.12
Methodological Influence: The systematic, written nature of Justinian’s civil law provided a model for canonists. Gratian, the father of canon law, utilized the juristic approaches developed by Bolognese civil law doctors to organize and harmonize ecclesiastical texts in his Decretum.13
Institutional Concepts: Many concepts within canon law—such as those regarding marriage law, wills, legal persons, and criminal procedure—were deeply informed by the reception of Roman law.2

Ultimately, this synthesis of Roman civil law and ecclesiastical authority helped establish the Western legal tradition, shaping the development of both secular and religious legal systems across Europe.12