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Filippo Calandri, Trattato di aritmetica
Filippo Calandri, Trattato di aritmetica

Late 15th cent.
Parchment codex; ff. XII, 110; 17x11 cm
Florence, Biblioteca Riccardiana, Ricc. 2669

This treatise, dedicated to Giuliano de’ Medici, demonstrates how the "practice of marketing" from which the Medici wealth originated was considered a fundamental element for the education of a young family member. On the frontispiece is depicted Pythagoras working in his studio.