The first of the Mysteries of Light – a series of meditations popularised  by Saint Pope John Paul II in 2002, in the Apostolic Letter On the Most Holy Rosary,  is the Mystery of the Baptism of the Lord:

Mystery of the Light, Baptism web

Mystery: The Baptism of Jesus in the Jordan by John (Mt 3:13-17)

Intention:  Pray 4 a deeper gratitude for my baptism, my being made 1 with Christ and the Church