Cange's own terminology expounded in the Praefatio, such as scriptores mediae aetatis, "writers of the middle age". Du Cange's Glossary takes words from authors ranging from the Christian period (Late Latin) to the Renaissance, dipping into the classical period if a word originated there. Either media et infima Latinitas refers to one age, which must be the middle age covering the entire post-classical range, or it refers to two consecutive periods, infima Latinitas and media Latinitas. Both interpretations have their adherents. In the former case, the infimae appears extraneous; it recognizes the corruptio of the corrupta Latinitas du Cange said his Glossary covered. The two-period case postulates a second unity of style, infima Latinitas, translated into English as "Low Latin" (which in the one-period case would be identical to media Latinitas). Du Cange in the glossarial part of his Glossary identifies some words as being used by purioris Latinitatis scriptores, such as Cicero (of the Golden Age). He has already said in the Preface that he rejects the ages scheme used by some: Golden Age, Silver Age, Brass Age, Iron Age. A second category are the inferioris Latinitatis scriptores, such as Apuleius (Silver Age). The third and main category are the infimae Latinitatis scriptores, who must be post-classical; that is, Late Latin, unless they are also medieval. His failure to state which authors are low leaves the issue unresolved. He does, however, give some idea of the source of his infima, which is a classical word, "lowest", of which the comparative degree is inferior, "lower". In the preface, he opposes the style of the scriptores aevi inferioris (Silver Age) to the elegantes sermones, "elegant speech", the high and low styles of Latinitas defined by the classical authors. Apparently, du Cange was basing his low style on sermo humilis, the simplified speech devised by Late Latin Christian writers to address the ordinary people. Humilis (humble, humility) means "low", "of the ground". The Christian writers were not interested in the elegant speech of the best or classical Latin, which belonged to their aristocratic pagan opponents. Instead, they preferred a humbler style lower in correctness, so that they might better deliver the gospel to the vulgus or "common people". Low Latin in this view is the Latin of the two periods in which it has the least degree of purity, or is most corrupt. By corrupt, du Cange only meant that the language