The names of the twelve disciples of Jesus are Simon Peter, Andrew, James (the son of Zebedee), John, Philip, Bartholomew, Thomas, Matthew, James (the son of Alphaeus), Thaddaeus, Simon the Zealot and Judas Iscariot. Several of Jesus' disciples are referred to by alternate names at various points in the Bible and in Christian literature.
Bartholomew is sometimes called Nathanael. Thaddeus is elsewhere called Jude. Matthew is also known as Levi. Simon Peter is sometimes referred to simply as Peter. James the son of Zebedee is sometimes referred to as James the Greater because he is widely considered to have been part of Jesus' inner circle. Thomas is also known as Doubting Thomas because when he first encountered Jesus after the resurrection, he did not believe the person he was seeing was truly Jesus until he had touched the wounds from the crucifixion on his body. James the son of Alphaeus is sometimes called James the Less or James the Lesser because little is known about him, except that he was present in the Upper Room in Jerusalem after Christ ascended to heaven. James and John were brothers and were referred to by Jesus as Boanerges, which means Sons of Thunder.