Azo of Bologna

Azo of Bologna or Azzo or Azolenus (fl. 1150–1230) was an influential Italian jurist and a member of the school of the so-called glossators. Born circa 1150 in Bologna, Azo studied under Joannes Bassianus and became professor of civil law at Bologna. He was a teacher of Franciscus Accursius. He is sometimes known as Azo Soldanus, from his father's surname, and also Azzo Porcius (dei Porci), to distinguish him from later famous Italians named Azzo. He died circa 1230.

Azo wrote glosses on all parts of the Corpus Iuris Civilis. His most influential work is his Summa Codicis, a commentary of the civil law organized according to the order of Justinian's Code. The Summa Codicis, and Apparatus ad codicem, collected by his pupil, Alessandro de Santo Aegidio, and amended by Hugolinus and Odofredus, formed a methodical exposition of Roman law. As one of the very few medieval legal texts in Latin, the Summa Codicis has been translated into Old French.