Introduction; Part I. The Acts of Thomas: 1. The Acts of Thomas and its impact; Part II. Christianity, Networks, and the Red Sea: 2. Early Christianity and its many Indias: complexities of the sources; 3. The Roman Egyptian network, the Red Sea, and the Indian Ocean; Part III. Christianity, Networks, and the Middle East: 4. The movement of Christianity into Sasanian Persia: perspectives and sources; 5. Social connectivity between the Roman Levant, Persian Gulf, and Central Asia; 6. The Late Antique impact of the Acts of Thomas and Christian communities in India; Conclusion.