Marcion of Sinope
Some time in the second century, the heretical Christian thinker Marcion of Sinope published his own Christian canon which contained a shorter version of the Gospel of Luke (the Gospel of Marcion) and ten Pauline epistles. Trobisch holds the view, shared by scholars such as John Knox and Joseph Tyson, that the gospel used by Marcion is earlier than the canonical Luke-Acts, and that Luke-Acts was in fact published as a response to Marcion's canon, contemporaneously with the publishing of the first edition of the New Testament as a whole.