This article aims to complete and correct the existing analyses of the unpublished Expositum in Heptateuchum of John the Deacon (mid-sixth century) by studying sixteen fragments of patristic works that have not or not properly been identified. A new critical examination of nine fragments edited by Jean-Baptiste Pitra in 1852 makes it possible to specify their nature and to propose a better founded localization in various works of Origen (Stromata, Peri physeon, Letter to Gobarus), of Didymus of Alexandria (De fide) and of Augustine (Sermo Delmulle 1). Seven other fragments, not previously identified, are published here for the first time: a new passage from a Latin translation of Justinian’s Edictum aduersus Origenem, a tractatus on Joshua attributable to Gregory of Elvira, four pieces on Genesis probably from Augustine’s preaching, and a sentence by Victor of Capua. Each of these fragments is the subject of a critical edition and attribution criticism.