Judas Iscariot
Judas Iscariot (died AD) was a disciple and one of the original Twelve Disciples of Jesus Christ. According to all four canonical gospels, Judas betrayed Jesus to the Sanhedrin in the Garden of Gethsemane by kissing him and addressing him as "Rabbi" to reveal his identity to the crowd who had come to arrest him. His name is often used synonymously with betrayal or treason. Judas's epithet "Iscariot" most likely means he came from the village of Kerioth, but this explanation is not universally accepted and many other possibilities have been suggested.
Kiss of Judas
The kiss of Judas, also known (especially in art) as the Betrayal of Christ, is how Judas identified Jesus to the multitude with swords and clubs who had come from the chief priests and elders of the people to arrest him, according to the Synoptic Gospels. The kiss is given by Judas in the Garden of Gethsemane after the Last Supper and leads directly to the arrest of Jesus by the police force of the Sanhedrin.