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Learning from Gaius? Different Layers in Gratian’s Decretum and Research on Roman Law

Both the ancient Roman jurist Gaius and the medieval magister Gratian authored an introduction 
to law. Since the discovery that the Decretum of Gratian evolved in stages, its evolution 
has attracted the interest of many scholars. "Chis contribution analyses the readmission of 
simonists and the necessity of reordination, a topic treated by Gratian in C.l q.7. It compares 
both versions of the Decretum and argues that the first version resembles a lean treaty of law, 
whereas the second version takes up features of canonical collections. Inevaluating both layers 
of Gratian's Decretum, research on Gaius's Institutes is instructive, as they are al so considered 
to have evolved in different layers. This research on interpolations has faced fundamental 
critique, but it is still possible to learn from former research on Roman law when assessing 
the different stages of Gratian's Decretum. One should therefore not assess the quality or the 
strengths and weaknesses of each stage, but its function as a teaching tool.