In 1484, the Florentine humanist and philosopher Marsilio Ficino (1433–1499) published the first complete translation of Plato, but his Greek to Latin translations of Iamblichus’s (a Syrian who lived ca. 245–325 CE) De secta Pythagorica and Theon of Smyrna’s (fl. first century CE) Mathematica remain unprinted. They were thought lost before P. O. Kristeller identified their manuscripts, have not been studied extensively, and many recent studies still ignore their existence. I have been editing these texts during the past three summers and will print them for the first time with the Ficinus Novus series of Nino Aragno Editore (Turin). My editions will include a book-length study of four topics: (1) Greek to Latin translations of philosophy in the Middle Ages and the Renaissance; (2) the development of Ficino’s translations; (3) their place in Ficino’s oeuvre and the history of philosophy; and (4) a study of the fortune of these works in the Renaissance, especially in scholarly, artistic, and religious communities in Florence and Rome. Ficino’s translations of these texts are the first reintroduction of the largest ancient corpus of Pythagoreanism in the Renaissance.