The word "heresy" comes from the Greek αἵρεσις,
hairesis (from αιρεομαι,
haireomai, "choose"), which means either a
choice of beliefs
or a faction of dissident believers. It was given wide currency by
Irenaeus of Lyons in his tract
The Detection and Refutation of False Knowledge (commonly known by the title of the Latin translation,
Contra Haereses (
Against Heresies)
to describe and discredit his opponents in the early Christian Church. He described his own position as orthodox (from
ortho- "right" +
doxa "glory" or "belief")
and his position eventually evolved into the position of the early Christian Church.