The so-called Codex Seguierianus, Paris, BNF, lat. 10592, a collection of works of Cyprian of Carthage written in the 5th and 6th centuries, has been described as “the” Cyprian manuscript used by Florus of Lyon (fl. c. 825–855). But when cross-referencing every use of Cyprian in Florus’ works and every trace left by Florus within the Seguierianus, they overlap in only one instance. In his works, then, Florus nearly always used manuscripts other than the Seguierianus — and conversely, the traces he left in the Seguierianus are records of other of Florus’ studies that either have not survived or have not yet been identified. In particular, Florus used the Seguierianus for editorial purposes, the impact of which on the Cyprian tradition remains to be assessed.