The Epilogue situates the close of late antiquity and the rise of Islam within a broader narrative of continuity, exchange, and transformation. It opens with Gregory the Great’s reflections on unity and diversity in the Christian Church, marking the culmination of the late antique synthesis of faith, philosophy, and governance. From there, it turns eastward to the origins of Islam, recounting Muhammad’s revelatory experience and the early spread of a faith that would, within a century, unite vast territories from Arabia to Spain and Central Asia. The emergence of Islamic centers of learning—Baghdad, Bukhara, Samarkand—revived Greek philosophy in Arabic translation and interpretation, producing thinkers such as Al-Kindi, Al-Farabi, Avicenna, and Averroes, whose reconciling of faith and reason later informed the scholastic debates of the Latin West. The chapter closes with a return to Europe and to figures like the twelfth-century scribe Guda, whose self-portrait in a manuscript reminds us that women, too, shaped medieval intellectual life. Across these worlds, the Epilogue underscores that “Western” thought has always been the product of conversation—between Greeks, Romans, Jews, Christians, and Muslims; between men and women; between faith and reason.