jurist, one of the “four doctors” of the Bologna Law School, and an important successor of Irnerius, although probably not his pupil.

Martinus, who advocated a more liberal interpretation of the law than did his Bolognese contemporary Bulgarus, gave considerable weight to equity; (equity) critics called his approach the equity of the purse (aequitas bursalis). Like Bulgarus, he was an adherent of the Holy Roman emperor Frederick I Barbarossa and supported imperial claims at the Diet of Roncaglia (1158). Martinus, whose opinions were quoted in imperial and papal documents of his time, wrote a commentary on the Corpus Juris Civilis, or Code of Justinian (Justinian, Code of).