section_path: Iron Age
section_name: Iron Age
paragraph_text: Iron Age
  
  The Iron Age is not part of prehistory for all civilizations who had introduced written records during the Bronze Age. Most remaining civilizations did so during the Iron Age, often through conquest by empires, which continued to expand during this period. For example, in most of Europe conquest by the Roman Empire means the term Iron Age is replaced by "Roman", " Gallo-Roman ", and similar terms after the conquest. Even before conquest, many areas began to have a protohistory, as they were written about by literate cultures; the protohistory of Ireland is an example.
  
  In archaeology, the Iron Age refers to the advent of ferrous metallurgy. The adoption of iron coincided with other changes, often including more sophisticated agricultural practices, religious beliefs and artistic styles, which makes the archaeological Iron Age coincide with the " Axial Age " in the history of philosophy. Although iron ore is common, the metalworking techniques necessary to use iron are different from those needed for the metal used earlier, more heat is required. Once the technical challenge had been solved, iron replaced bronze as its higher abundance meant armies could be armed much more easily with iron weapons.