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Canon law, jus canonicum, is the sum of the laws which regulate the ecclesiastical body; for this reason it is also called ecclesiastical law, jus ecclesiasticum.

As to the expression jus canonicum, it implies the systematic codification of ecclesiastical legislation, and had no existence previous to the labours which resulted in the Corpus juris canonici.

Azo Lambertaccius, a canonist of the 13th century, professor of canon law at the university of Bologna, author of Questiones in jus canonicum, and Azo de Ramenghis, a canonist of the 14th century, also a professor of canon law at Bologna, and author of Repetitiones super libro Decretorum.

So far as the researches of the present writer extend, the only one that can be put into competition with them, is the Jus Canonicum of Van-Espen.