Although is used as a primary proof-text for the Catholic doctrine of Papal supremacy, Protestant scholars say that prior to the Reformation of the sixteenth century, Matthew 16 was very rarely used to support papal claims. Their position is that most of the early and medieval Church interpreted the 'rock' as being a reference either to Christ or to Peter's faith, not Peter himself. They understand Jesus' remark to have been his affirmation of Peter's testimony that Jesus was the Son of God.