The chief agitator or principal instigator of a rebellion, protest, or political disturbance; a leading rabble-rouser.
From Greek 'archi-' (chief, principal) + Latin 'agitator' (one who agitates, stirs up), combining to describe the primary leader of unrest or organized protest.
This word was used in 17th-century England to describe leading figures in civil unrest—it's more specific than 'leader' because it suggests someone who actively stirs people up into action, like a human megaphone!
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