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Concept
Periodization
Summary
In historiography, periodization is the process or study of categorizing the past into discrete, quantified, and named blocks of time for the purpose of study or analysis. This is usually done in order to understand current and historical processes, and the causality that might have linked those events.
Periodizations can provide a convenient segmentation of time, wherein events within the period might consist of relatively similar characteristics. However, determining the precise beginning and ending of any 'period' is often arbitrary, since it has changed over time and over the course of history. Systems of periodization are more or less arbitrary, yet it provides a framework to help us understand them. Periodizing labels are continually challenged and redefined, but once established, period "brands" are so convenient that many are hard to change.
The practice of dividing history into ages or periods is as early as the development of writing, and can be traced to the Sumerian period. The Sumerian King List, dating to the second millennium BC—and for most parts it is not considered historically accurate—is "periodized" into dynastic regnal eras. The classical division into a Golden Age, Silver Age, Bronze Age, Heroic Age, and Iron Age goes back to Hesiod in the 8th – 7th century BC.
One Biblical periodization scheme commonly used in the Middle Ages was Saint Paul's theological division of history into three ages: the first before the age of Moses (under nature); the second under Mosaic law (under law); the third in the age of Christ (under grace). But perhaps the most widely discussed periodization scheme of the Middle Ages was the Six Ages of the World, written by the early 5th century AD, where every age was a thousand years counting from Adam to the present, with the present time (in the Middle Ages) being the sixth and final age.
Periodizing blocks might overlap, conflict or contradict one another. Some have a cultural usage (the "Gilded Age"), others refer to prominent historical events ('the Interwar period), while others are defined by decimal numbering systems ('the 1960s', 'the 17th century').
Official source
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