To suggest that the other evangelists simply copied from Mark is not supported by the facts. If they copied from Mark, one would expect each list of the apostles in the other Gospels and Acts to agree 100% with Mark’s but this is not the case, as can be seen below:2The names of the twelve apostles are these: first, Simon, who is called Peter, and Andrew his brother; James the son of Zeb’edee, and John his brother; 3Philip and Bartholomew; Thomas and Matthew the tax collector; James the son of Alphaeus, and Thaddaeus; 4Simon the Cananaean, and Judas Iscariot, who betrayed him. (Matthew 10:2-4)
14And he appointed twelve, to be with him, and to be sent out to preach 15and have authority to cast out demons: 16Simon whom he surnamed Peter; 17James the son of Zeb’edee and John the brother of James, whom he surnamed Bo-aner’ges, that is, sons of thunder; 18Andrew, and Philip, and Bartholomew, and Matthew, and Thomas, and James the son of Alphaeus, and Thaddaeus, and Simon the Cananaean, 19and Judas Iscariot, who betrayed him. (Mark 3:14-19)
[size=1]13And when it was day, he called his disciples, and chose from them twelve, whom he named apostles; 14Simon, whom he named Peter, and Andrew his brother, and James and John, and Philip, and Bartholomew, 15and Matthew, and Thomas, and James the son of Alphaeus, and Simon who was called the Zealot, 16and Judas the son of James, and Judas Iscariot, who became a traitor. (Luke 6:13-16)
[size=1]13[/size]and when they had entered, they went up to the upper room, where they were staying, Peter and John and James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus and Simon the Zealot and Judas the son of James. (Acts 1:13)
What a careful examination of these lists does show is that Peter is always mentioned first and that Judas Iscariot is mentioned last. Judas Iscariot is arguably the least of the Twelve because he betrayed Christ. Since the least of the Twelve appears last on the lists, one can reasonably assume that the greatest of the Twelve, appears first on the lists, namely Peter.