Widespread evidence from the early church fathers affirms that Peter passed on reports of the words and deeds of Jesus to his attendant and writer, John Mark.
Of particular significance in this regard are the brief statements by Papias (Bishop of Hierapolis; C.A.D. 120), preserved by Eusebius of Caesarea (260-340).
Papias states that he received oral tradition from John the elder and apostle, and he passes on the following regarding Mark:
(1) he was the writer for Peter; (2) he wrote down accurately as much as he could remember of Peter's words, which the latter had adapted to the needs of the moment;
(3) he was not an eyewitness of Jesus, nor a disciple (but see note on Mark 14:52); and (4) it was his desire not to omit or misrepresent anything.
Papias concluded that the Gospel of Mark gains its apostolic and reliable character from its Petrine origin
(Eusebius, Ecclesiastical History 2.15.1-2; 3.39.14-16).
Internal evidence also supports the Patristic testimony that Peter stands behind Mark's Gospel. Mark's account is especially vivid when recounting incidents involving Peter.
It presents the weaknesses of Peter, as well as the disciples as a whole, and omits praiseworthy or noticeable references to Peter reported in Matthew and Luke.
It has also been observed that there exists a certain structural proximity between Peter's Caesarea speech
(Acts 10:34-43) and the Gospel of Mark. [ESVSB pg. 1889]
The external and internal data most convincingly point to Rome as the place of composition and a date for Mark in the mid- to late-50s A.D.
(but some scholars date it in the mid- or late-60s; see below). The argument in favor of the mid- to late-50s is that the book of Acts ends with Paul in prison c. A.D. 62,
leading many scholars to believe that Acts was written around that time. (Others suggest that Acts does not end at the point it was written because the key point of Acts
is that the gospel had made it to Rome.) If Acts was written in the early 60s, then Luke's Gospel was written before Acts
(cf. Luke 1:3 with Acts 1:1), sometime in the early 60s.
And if Luke depends on Mark's Gospel for much of his material and overall structure (the clear majority view among scholars today),
then Mark was written before Luke. This would place Mark in the mid- to late-50s. In fact, such a date fits with an early church tradition
that Peter was in Rome in the early-to mid-50s. Eusebius (writing c. A.D. 325) says,
"in the same reign of Claudius [who died in A.D. 54] the Providence of the universe... guided to Rome the great and mighty Peter... preaching the gospel....
But... the hearers of Peter... were not satisfied with a single hearing... but with every kind of exhortation besought Mark...
seeing that he was Peter's follower, to leave them a written statement of the teaching given them verbally, nor did they cease until they had persuaded him,
and so became the cause of the Scripture called the Gospel of Mark"
(Eusebius, Ecclesiastical History 2.14.6-2.15.1; cf. a similar tradition in 6.14.6-7, quoting Clement of Alexandria, who lived c. 155-220).
The Anti-Marcionite Prologue to Mark (late 2nd century A.D.) also places the writing during Peter's lifetime, for it says that Mark
"wrote this gospel in parts of Italy. When Peter heard this, he approved and affirmed it by his own authority for the reading of the church."
However, if a somewhat later date for Luke-Acts is adopted, or if the similarities between Mark and Luke do not demonstrate that Luke used a completed written copy of Mark,
then a date for Mark in the mid- to late-60s is possible. Some find support for this in a statement from Irenaeus (d.c. A.D. 195) that,
"After their [Peter and Paul's] departure, Mark, the disciple and interpreter of Peter, did also hand down to us in writing what had been preached by Peter"
(Against Heresies 3.1.2). If Peter's "departure" refers to his death, and Peter died in A.D. 64, then the Gospel of Mark would have been written after 64,
the year Peter died. On the other hand, this may refer not to the writing but to the publication of Mark, or may speak of Peter and Paul's "departure" from Rome, not their death.
So a date in the mid- to late-50s is most likely, but a date in the mid-60s is possible. [ESVSB pg. 1889-1890]
The ultimate purpose and theme of Mark is to present and defend Jesus' universal call to discipleship. Mark returns often to this theme, and as the narrative unfolds he categorizes his main audience as either followers or opponents of Jesus. This fact implies that discipleship for Mark is essentially a relationship with Jesus, not merely following a certain code of conduct. Fellowship with Jesus marks the heart of the disciple's life, and this fellowship includes trusting him, confessing him, taking note of his conduct, following his teaching, and being shaped by a relationship to him. Discipleship also means being prepared to face the kind of rejection that Jesus faced. [ESVSB pg. 1891-1892]