Although the surname Comestor (Latin for "Eater") was popularly attributed to his habit of devouring books and learning, it was more probably simply a family name.
By 1160, Peter had returned to Paris to teach, holding the chair of theology at the university, from which he retired in 1169.
He was made chancellor of Notre Dame in Paris around 1164, which put him, among other things, in charge of the cathedral school.
[7] Peter's most famous work was his Historia Scholastica: as Beryl Smalley called it, a 'great study of biblical history'.
[8] The Historia was completed by 1173, Peter having spent some time writing it at the Abbey of Saint Victor.