Judas Iscariot
There are several explanations as to why Judas betrayed Jesus. In the earliest account, in the Gospel of Mark, when he goes to the chief priests to betray Jesus, he is offered money as a reward, but it is not clear that money is his motivation. In the Gospel of Matthew account, on the other hand, he asks what they will pay him for handing Jesus over. In the Gospel of Luke and the Gospel of John, the devil enters into Judas, causing him to offer to betray Jesus. The Gospel of John account has Judas complaining that money has been spent on expensive perfumes to anoint Jesus which could have been spent on the poor, but adds that he was the keeper of the apostles' purse and used to steal from it.
Judas Iscariot
Judas has been a figure of great interest to esoteric groups, such as many Gnostic sects. Irenaeus records the beliefs of one Gnostic sect, the Cainites, who believed that Judas was an instrument of the Sophia, Divine Wisdom, thus earning the hatred of the Demiurge. His betrayal of Jesus thus was a victory over the materialist world. The Cainites later split into two groups, disagreeing over the ultimate significance of Jesus in their cosmology.