The names of the 12 disciples are Simon, who Jesus renamed Peter; Simon's brother Andrew; James and his brother, John; Philip; Bartholomew; and Matthew. The others were Thomas; James, the son of Alphaeus; Simon the Zealot; Judas, who was the son of James and also known as Thaddaeus; and Judas Iscariot.
Simon Peter was the first Pope. Originally, he was a fisherman who worked on Lake Galilee. Like Jesus, he was crucified, but insisted on being crucified upside down, as he wasn't worthy of being crucified in the same way as his Lord.
Peter's brother Andrew is believed to have preached throughout Greece and Asia Minor. Eventually, he was martyred in Greece.
John was considered the "disciple whom Jesus loved." He took care of Jesus' mother Mary after Jesus was crucified and died at an advanced age in Ephesus.
James, the son of Alphaeus, was also called James the less. Theologians believe he was a cousin of Jesus.
Matthew, also called Levi, was a tax collector, which meant he was looked down upon by the Jews of the time. He was martyred in Ethiopia.
Philip was a native of Bethsaida and is said to have introduced Bartholomew to Jesus. He preached in Egypt and Persia and was martyred in Hierapolis.