The alternative term medieval derives from medium aevum, tripartite periodisation became standard after the German 17th-century historian Christoph Cellarius. This threefold periodization was first employed by George Hornius, a Dutch historian in his Arca Noae (1666), and became widely known later through Christophorus Cellarius, a German historian, in his Historia nova, hoc est XVI et XVII saeculorum (1696).
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