Trinity College, Cambridge, ms B.15.5, contains a copy of Peter Comestor's Historia scholastica, donated by Nigel of Canterbury to the library at Christ Church. This article focuses on the exegetical content of its dense annotations. Heavily dependent on the writings of theologians associated with the school of St Victor, they offer an insight into the kinds of sources which were read alongside the Historia scholastica in this period. The article also queries a note made on the flyleaf which identifies Nigel as the compiler, examining its credibility and its implications for the presumed chronology of his life.