This monograph is the first to analyze Julius Caesar Scaliger’s Exotericae Exercitationes (1557). Though hardly read today, the Exercitationes was one of the most successful philosophical treatises of the time, attracting considerable attention from many intellectuals with multifaceted religious and philosophical orientations. In order to make this massive late-Renaissance work accessible to modern readers, Kuni Sakamoto conducted a detailed textual analysis and revealed the basic tenets of Scaliger’s philosophy. His analysis also enabled him to clarify the historical provenance of Scaliger’s Aristotelianism and the way it subsequently influenced some of the protagonists of the “New Philosophy.” The author thus bridges the historiographical gap between studies of Renaissance philosophy and those of the seventeenth-century.