Chapter 2 offers an introduction to the history of Islam and Muslims with a focus on events and processes that influenced and remained important for the origin and development of the Muslim firaq. It examines the period of late antiquity, what the Qurʾan has to say about sectarian splintering, the Prophetic era, and the period after the death of the Prophet. It focuses in particular on the events of the Saqīfa, the first Muslim fitna (civil war), and the establishment of the early Muslim dynasties. The shift from the Umayyad to the ʿAbbāsid eras offers an introduction to the idea of a Muslim school of thought, while the notion of caliphal power is examined using the examples of Umayyad persecution of “heretics,” as well as the miḥna. The Turkic invasions, including the Mongols, offers an opportunity to examine the nature of political and military power, and to see how such configurations change with the introduction of gunpowder and the establishment of the “gunpowder empires.”