Traditionally, historians have recorded events of the past, either in writing or by passing on an oral tradition, and have attempted to answer historical questions through the study of written documents and oral accounts. For the beginning, historians have also used such sources as monuments, inscriptions, and pictures. In general, the sources of historical knowledge can be separated into three categories: what is written, what is said, and what is physically preserved, and historians often consult all three.[16] But writing is the marker that separates history from what comes before.
Archaeology is a discipline that is especially helpful in dealing with buried sites and objects, which, once unearthed, contribute to the study of history. But archaeology rarely stands alone. It uses narrative sources to complement its discoveries. However, archaeology is constituted by a range of methodologies and approaches which are independent from history; that is to say, archaeology does not "fill the gaps" within textual sources. Indeed, Historical Archaeology is a specific branch of archaeology, often contrasting its conclusions against those of contemporary textual sources. For example, Mark Leone, the excavator and interpreter of historical Annapolis, Maryland, USA has sought to understand the contradiction between textual documents and the material record, demonstrating the possession of slaves and the inequalities of wealth apparent via the study of the total historical environment, despite the ideology of "liberty" inherent in written documents at this time.
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