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Institutio Oratoria, Quintilian's influential work on rhetoric and oratory, was rediscovered in the 15th century by the Italian scholar Poggio Bracciolini. Written in the 1st century AD, this comprehensive treatise served as a guide for aspiring orators and covered topics such as grammar, style, delivery, and persuasive techniques. Its rediscovery during the Renaissance had a profound impact on European education and influenced the development of humanistic thought and intellectual inquiry.