When members of the early rabbinic group created the Jewish legal text known as the Mishnah in the late second or early third century, the concept of heresy was relatively common in the wider cultural discourse of the Roman world. Christian apologists, among others, frequently employed the Greek termhairesis(“heresy”/“heretic,” originally meaning “school of thought”/“adherent”) as part of their larger projects of drawing boundaries, defining identities, and making an argument for the authority of their own ideas and practices.