Oscar Montelius (9 September, 1843 - 4 November, 1921) was a Swedish archaeologist who refined the concept of seriation, a relative chronological dating method. Seriation is the procedure of working out a chronology by arranging material remains of a cultural tradition in the order that produces the most consistent patterning of their cultural traits.

His impetus was at first to provide relative dates for artifacts in museum collections that often lacked rigorous records, by making comparisons with other artifacts within a comparable geographical area. Montelius’ method created a timeline specific to the location, based on material remains. Later, when combined with written historical references, objects could be provided absolute dates.

He took the three-age system (Stone age, Bronze age, Iron age), originally devised by Christian Jürgensen Thomsen to organize Danish museum collections of archaeological materials, and sub-divided it further. He divided the Neolithic in Scandinavia into four numbered periods, I-IV, and the Bronze Age into three more I-III.

By taking calendrical dates from the recently deciphered hieroglyphics of Ancient Egypt, Montelius employed a complex system of cross-dating through typologies and associated finds to apply absolute dates to archaeological finds and features all over Europe.

His diffusionist theories were eventually displaced by more complex views of cultural interaction but following refinement his system of sub-divisions is still effectively in use. Montelius was made a member of the Swedish Academy in 1917.

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• Oscar Montelius