A lot of history is just guessing, but if they can find enough sources, and prove they are from the time period suggested, and also link that to how events after that were effected to produce the same results in history, then they have a case that could possibly be what happenend.
The thing about hhistory is that no one get's to make it up or make suggestions. A certain set of events happened everywhere at the same time, and the results it produced caused more results leading all the way into now. Keep that in mind when hear historians say "this was probably used for..." they don't know. A lot of history will never be known. But there are some very import ant events in history that could change your life, and it's very much worth pondering and uncovering for yourself how truthful and accurate it actdually is.
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