Saint Dismas - AbsoluteAstronomy.com

The Penitent thief, also known as the Thief on the Cross or the Good Thief, is an unnamed character mentioned in the Gospel of Luke

Gospel of Luke

The Gospel According to Luke , commonly shortened to the Gospel of Luke or simply Luke, is the third and longest of the four canonical Gospels. This synoptic gospel is an account of the life and ministry of Jesus of Nazareth. It details his story from the events of his birth to his Ascension.The...

who was crucified alongside Jesus

Jesus

Jesus of Nazareth , commonly referred to as Jesus Christ or simply as Jesus or Christ, is the central figure of Christianity...

and asked Jesus to remember him in his kingdom.

In different Christian traditions different names have been given to the thief:

In the Gospel of Nicodemus and Catholic
Catholic
The word catholic comes from the Greek phrase , meaning "on the whole," "according to the whole" or "in general", and is a combination of the Greek words meaning "about" and meaning "whole"...

tradition the name Dismas is given to the thief.