Peter, James, and John were three of the twelve apostles chosen by Jesus in the New Testament of the Bible. They played significant roles in spreading the teachings of Christianity after Jesus' resurrection. Peter is often considered the leader of the apostles, known for his strong faith and later becoming a prominent figure in the early church. James, the son of Zebedee, was known for his zeal and was one of the first apostles to be martyred. John, also the son of Zebedee, is often referred to as the "beloved disciple" and is traditionally credited with writing the Gospel of John and the Book of Revelation. Together, they witnessed many key events in Jesus' ministry.