Petrus Comestor, also called Pierre le Mangeur (died 22 October 1178), was a twelfth-century French theological writer and university teacher.

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Petrus Comestor was born in Troyes. Although the name Comestor (Latin for 'eater', le Mangeur in French) was popularly attributed to his habit of devouring books and learning, it was probably, and more prosaically, a family name.^[1][2] It did, however, give Peter a nice pun for his epitaph (supposed to have been composed by him): Petrus eram quem petra tegit,/ dictusque Comestor nunc comedor (I was Peter, whom this stone covers,/ called 'devourer', now I am devoured). (For a text of it, see Petrus Comestor.)

As a young man, Peter studied at the Troyes Cathedral school, where he might have come into contact with Peter Abelard.;^[3] sometime later, he was a student in Paris under, amongst others, Peter Lombard.^[4] By 1147, he was back in Troyes, having been appointed dean of Troyes Cathedral. 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, amongst other things, in charge of the cathedral school, and which post he held until his death in 1178.^[5] Peter's reputation as an academic was such that Pope Alexander III exempted Peter from his ban on charging fees for giving licences to teach.^[6]

Peter was buried in the Abbey of Saint Victor, and he may have retired and become a canon there; he was celebrated as such by the canons in their necrology.^[7]

• Petris Comestoris Scolastica Historia: Liber Genesis. Edited by Agneta Sylwan. Turnhout: Brepols, 2004, Pp. xc + 227. (Corpus Christianorum Continuatio Mediaevalis, 191). ISBN 978-2503049113