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By convention, the Iron Age in the Ancient Near East is taken to last from c. 1200 BC (the Bronze Age collapse) to c. 550 BC (or 539 BC), taken as the beginning of historiography (Herodotus) or the end of the proto-historical period.
In Central and Western Europe, the Iron Age is taken to last from c. 800 BC to c. 1 BC, in Northern Europe from c. 500 BC to 800 AD.
In China, there is no recognizable prehistoric period characterized by ironworking, as Bronze Age China transitions almost directly into the Qin dynasty of imperial China; "Iron Age" in the context of China is sometimes used for the transitonal period of c. 500 BC to 100 BC during which ferrous metallurgy was present even if not dominant.
c. 550 BC (or 539 BC