The Gospel of Marcion, also known as the Evangelion or The Gospel of the Lord, represents, according to many scholars, one of the earliest known attempts at Christian gospel redaction. Others believe the author of the Gospel of Luke may have used Marcion's document to write Luke's Gospel. Traditionally attributed to the 2nd-century theologian and pronounced heretic, Marcion of Sinope, this gospel offers profound insight into the theological tensions of early Christianity, particularly concerning the role of the Hebrew Scriptures, the identity of Jesus, and the development of the New Testament canon. Though the text itself has not survived, it can be reconstructed in part from the polemical writings of Marcion’s opponents—most notably Tertullian, Epiphanius, and later Origen—who quoted and critiqued the gospel extensively. This book examines the history of the Gospel of Marcion, its theological significance and ecclesiastical impact, and its complex and contested relationship to the canonical Gospel of Luke. It ends with a partial reconstruction of the Gospel of the Lord.