For before certain men came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them who were of the circumcision.
All Commentaries on Galatians 2:12 Go To Galatians 2
Tertullian of Carthage
AD 220
Paul, however, censures Peter for not walking straightforwardly according to the truth of the gospel. No doubt he blames him; but it was solely because of his inconsistency in the matter of "eating".
which he varied according to the sort of persons (whom he associated with) "fearing them which were of the circumcision"