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ExplanationThe three-age system is the periodization of history into three time periods;[1][better source needed] for example: the Stone Age, the Bronze Age, and the Iron Age; although it also refers to other tripartite divisions of historic time periods. In history, archaeology and physical anthropology, the three-age system is a methodological concept adopted during the 19th century by which artifacts and events of late prehistory and early history could be ordered into a recognizable chronology. It was initially developed by C. J. Thomsen, director of the Royal Museum of Nordic Antiquities, Copenhagen, as a means to classify the museum's collections according to whether the artifacts were made of stone, bronze, or iron.