On the Most Ancient Wisdom of the Italians, originally published in 1710, is widely regarded as Vico's most significant work after the New Science and the Autobiography. Subtitled "The Book of Metaphysics," it was one of three planned volumes of a larger work that was never published, and it marks Vico's transition from rhetorician to philosopher of historical knowledge. This edition incorporates translations from the Italian of a contemporary review and Vico's responses, published in 1711 and 1712. L. M. Palmer's translation helps make more accessible a treatise of vital importance for an understanding of Vico's epistemology, psychology, and philosophy of mathematics.