Pierre Allix was a French Protestant pastor and author. In 1690 Allix was created Doctor of Divinity by Emmanuel College, Cambridge, and was given the treasurership and a canonry in Salisbury Cathedral by Bishop Gilbert Burnet. He discovered that Codex Ephraemi is a palimpsest.

The Codex Ephraemi Rescriptus designated by the siglum C or 04, δ 3, is a manuscript of the Greek Bible, written on parchment. It contains most of the New Testament and some Old Testament books, with sizeable portions missing. It is one of the four great uncials. The manuscript is not intact: its current condition contains material from every New Testament book except 2 Thessalonians and 2 John; however, only six books of the Greek Old Testament are represented. It is not known whether 2 Thessalonians and 2 John were excluded on purpose, or whether no fragment of either epistle happened to survive.