Rufinus was an Italiancanon lawyer, described as the most influential canonist at theUniversity of Bologna in the mid 12th century.[1] He composed aSumma onGratian'sDecretum before 1159,[2] which soon became the most influential commentary in Bologna, surpassing all previous ones in detail and length.[3]
Stephen of Tournai, his pupil, quoted from hisSumma several times.[4]