This essay explores how and why three early Christian figures–Epiphanius, Romanos the Melode, and Ambrosiaster–have, at various times, been imagined as former Jews. By applying a hermeneutics of conversion, this essay argues that the significance of these three Christians’ ex-Jewishness lies not in its historicity (or falsity) but in the way Christians (ancient and modern) have tried to grapple with the Jewish “other” that lies so close to the Christian self.