A brief history of the biblical canon | Churchmouse Campanologist:
"Rome didn’t make the canon. The early church gradually received and recognized the 27 books that compose the NT as having intrinsic marks of canonicity. In that sense the canon is self-attesting. The church did not make the canon in some committee room. The church, over time, in various places, but quite early and rather unanimously (with a few minor exceptions) received most of the NT quite early (by the middle of the 2nd century)."
More can be found on this ChurchMouse post.
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