The doctrine of the person of Christ—fully God and fully man—sits at the center of Christian theology, and also at the center of the long rift between the Reformed and Lutheran branches of the Protestant Reformation. Triggered by growing disputes over Christ’s presence in the Eucharist, leading Protestant theologians sought to parse more carefully the relationship between Christ’s two natures, generating rich discussions of this crucial doctrine that remain lasting landmarks of Christian theology. Among these, Vermigli’s magisterial 1561 Dialogue on the Two Natures of Christ stands out for its clarity, precision, and thoroughness.