This non-fiction volume is the second in a scholarly series dedicated to Leonardo da Vinci, co-authored by Adolfo Venturi and Mario Cermenati. It focuses on a critical and historical examination of Leonardo’s artistic production, scientific endeavors, and intellectual contributions. The book is structured thematically, analyzing specific works and contextualizing them within Renaissance thought. Emphasis is placed on visual analysis, documentary sources, and biographical insights. Aimed at researchers and students of art history and Renaissance studies, it contributes to an in-depth understanding of Leonardo’s evolving legacy and influence.