Augustine of Hippo

(Tract. cxxiv) Our Lord having foretold to Peter by what death he should glorify God, bids him follow Him. And when He had spoken this, He saith unto him, Follow Me. Why does He say, Follow Me, to Peter, and not to the others who were present, who as disciples were following their Master? Or if we understand it of his martyrdom, was Peter the only one who died for the Christian truth? Was not James put to death by Herod? Some one will say that James was not crucified, and that this was fitly addressed to Peter, because he not only died, but suffered the death of the cross, as Christ did.