This is an excellent question. Proving that something happened 2,000
years ago is obviously challenging for a number of reasons: lack of
formal records, differences in the calendar, and, as you mention,
historical accounts that are not necessarily credible. So how is that
historians can make any claims at all? How do historians know that
Julius Caesar was assassinated on exactly March 15th in 44 BC?
Indeed,how do historians know that Julius Caesar was assassinated at
all?
Heck, how do we even know that Julius Caesar really existed?
Fortunately, in the case of Roman history, there are many sources of
evidence. As you've mentioned, one area of proof is the written
historical record. In and of themselves, Tacitus' writing don't
necessarily prove anything. However, if the same claims made by
Tacitus appear in the works of other historians, then they gain
additional credibility. For example, similar details about Julius
Caesar's assassination also appear in the works of another Roman
historian, Seutonius. For an English translation of Seutonius'
account, visit this "Ancient History Sourcebook" page at Fordham
University:
http://www.fordham.edu/halsall/ancient/suetonius-julius.html
Suppose that multiple written accounts are still not convincing, where
do historians turn next? Suppose you say, "Well, okay, maybe Julius
Caesar really existed and was assassinated, but why should I believe
that he was assassinated on March 15th? Maybe one of the ancient
historians got the date wrong, and the rest copied him." Sure, that's
possible, but how can we explain away the existence of an ancient Roman
coin that features Caesar's assassin Brutus and displays the words "Eid
Mar" (middle day of March)?
Indeed such coin actually exists. See this page from Wild Winds
Numismatics:
http://www.wildwinds.com/coins/sear5/s1439.html
In the case of Roman history, coins provide an important part of the
historical record. Indeed, there is a wealth of scholarship relating
to Roman history as discovered through coins. See this essay, "Roman
Coins and Roman History" by Daniel J. Taylor on the web site of
Lawrence University:
http://www.lawrence.edu/dept/art/buerger/essays/romanc.html
There are also books such as Michael Grant's "Roman History From
Coins" and C.H.V. Sutherland's "Roman History and Coinage, 44 BC - Ad
69: Fifty Points of Relation from Julius Caesar to Vespasian." Read
descriptions about the books at Barnes and Noble:
http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?userid=68OE3OV2CG&isbn=0521095492
http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?userid=68OE3OV2CG&isbn=0198721242
Details about Roman history are also often confirmed in art and
architecture. The Romans were great sculptors, and details about
historical individuals and events are often revealed through
sculpture. The Romans made busts and statues of their leaders, and
many have survived through this day. See this page featuring busts of
Caesar from the Classics department at Beloit College:
http://www.beloit.edu/~classics/main/courses/history222/julius/
In a few cases, Roman art and architecture provides a direct
historical record. Accounts about Roman emporer Trajan might exist in
contemporary written histories, and you might learn about his invasion
of Dacia (modern day Romania) in one of those histories. However, an
equally important source of information would be the Column of Trajan in
Rome. The column depicts a sculpted relief of the events of the Dacian
invasion. See the Trajan's Column project at McMaster University:
http://cheiron.humanities.mcmaster.ca/~trajan/index.html
In summary, we can never be exactly sure that ancient history happened
exactly the way the ancient historians said that it did. However,details
from other historians as well as from things such as coins,art, and
architecture provide clues that help to confirm contemporary historical
accounts.
One thing left out:
Textual Criticism
One of the ways which the provenance of ancient texts is verified is
called "textual criticism".
Most web searches will bring up sites on Biblical textual criticism
but there are Tacitean texual critics as well.
Basically, they take all copies of a manuscript and compare what is
said to what is known from other manuscripts, the contradictions among
the similar texts and such things as writing style and copyist error.
It is a process of elimination more than anything else. Once they are
through whittling down what they have the end result is what has
veracity.
Of course, there is no way to be 100% certain that something is
correct but by this process they can come very close to knowing the
real truth.
Here are a couple of websites that will explain different aspects of
this science:
http://www.tektonics.org/copyisterrors.html
http://www.christianseparatist.org/ast/hist/textcrit.htm
http://www.stilez.freeserve.co.uk/apol/solomon.html
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