Subject: Canon Law
Author of work: Gratianus
Title: Decretum Gratiani
Subject: Canon Law
Author of work: Gratianus
Title: Decretum Gratiani
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Classics
Author of work: Ps. Ovidius
Title: De vetula
Subject: Philosophy
Author of work: Aegidius Romanus
Title: De regimine principum
Subject: Philosophy
Author of work: Aegidius Romanus
Title: De regimine principum
Subject: Philosophy
Author of work: Aegidius Romanus
Title: De regimine principum
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: History
Author of work: Poggius
Title: Defensiuncula
Subject: Philosophy
Title: De septem vitiis