Arian Baptistery, wall mosaic decoration, cupola: the Baptism of Christ. Christ is shown naked, beardless and half-submerged in the river. Christ is flanked by John the Baptist on the right and a personification of the river Jordan on the left. He is clad in a green cloak, holding a reed and crowned with crab claws. Above, the Holy Spirit in the form of a dove sprays lustral water from its beak.