According to the Gospel of Matthew 10:2, Simon (later Peter), Andrew, James the son of Zebedee, John and Philip were some of Jesus' apostles. Bartholomew, Thomas, Matthew, Thaddaeus and James the son of Alphaeus were others. Simon the Zealot and Judas Iscariot were also Jesus' apostles.
The common tasks of all the apostles included baptizing new members into the church and preaching the Gospel to the world, as recorded in Matthew 28:16-20. The apostles also had various levels of authority over the church or individual churches. Protestants, Orthodox Catholics and Roman Catholics disagree over the nature and extent of the authority of individual apostles. The Roman Catholic Church holds that Jesus commissioned Peter to be the head of the church, including over the other bishops. It bases its position on texts such as Matthew 16:18-19.
Matthew 10:2 mentions that Matthew was a tax collector, though he left that post to follow Jesus. The title of Zealot given to Simon is possibly a reference to his prior membership in the radical Zealot party.
Certain apostles are authors of books of the Bible, such as John, who wrote the Gospel of John and the Book of Revelation, and Peter, who wrote the Letters of Peter.