A notable deed or exploit, especially a brave or adventurous action; also, a tale or narrative of adventures.
From Old French 'geste' and Latin 'gesta' (deeds or exploits), the plural of 'gestum' (something done). Medieval literature used this term for epic poems recounting heroic adventures, like 'Chanson de Geste' (Song of Deeds).
The 'Chanson de Geste' is an entire genre of medieval French epic poems—imagine a collection of viral heroic stories where Roland, a famous knight, performs impossible feats of bravery and strength!
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