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thumb|Cenotaph of a centurion who died in the Battle of the Teutoburg Forest (AD 9). Teutoburg Forest is commonly seen as one of the most important defeats in Roman history, bringing the triumphant period of expansion under [[Augustus to an abrupt end. The outcome of this battle dissuaded the Romans from their ambition of conquering Germania, and is thus considered one of the most important events in European history.]]

year that does not exist in the Anno Domini / Common Era year-numbering system