The Latin word Formido(losus) used by the Romans to describe the enemy armies involved in a revolt, means " causing dread, terror,etc "
Sparatcus was called terriloquus by many roman historians, meaning he had a dreadful and terror filled way of speaking.
Mithridates IV of Pontus who declared war/revolted against the Romans was nicknamed Aversabilis ( to turn away for fear of death )
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As I said before, the British crown considered and called " The Sons of Liberty ", BEFORE and during the American Revolution, Terrorists.