Origin might derive farther back than from 1415:
Origin
In Ancient Greece it was known as the κατάπυγον (katapugon, from kata - κατά, "downwards" and pugē - πυγή, "rump, buttocks") and reference is made to using the finger in ancient Greek comedy to insult another person, where the term katapugon also meant "a male (or a female, katapugaina) who submits to anal penetration". It is identified as the digitus impudicus (impudent finger) in Ancient Roman writings and the widespread usage of the finger in many cultures is likely due to the geographical influence of the Roman Empire and Greco-Roman civilization. Another possible origin of this gesture can be found in the first-century Mediterranean world, where extending the finger was one of many methods used to divert the ever-present threat of the evil eye offense.
Source Wikipedia
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