The Baptistery of the Arians is located in the historic center of Ravenna, in the small square of the current Church of the Holy Spirit (once the cathedral of the Arians); it was built towards the end of the 5th century, when Theodoric had already consolidated his dominion and Arianism was the official religion of the court. The building has an octagonal plan and features four small apses on the outside. Unfortunately, the stuccoes and ornaments that once covered the walls have not been preserved. The decoration of the dome, covered with mosaics depicting the procession of the twelve apostles and the baptism of Christ, is still preserved. The mosaic, while maintaining the same iconographic layout as the Neonian Baptistery, from which it draws inspiration, testifies to the worship of Theodoric's court, of Arian faith. While in the Orthodox Baptistery the twelve apostles acclaim the Christ of the central clipeus as the Son of God, in the Baptistery of the Arians they pay homage to the great gemmed throne surmounted by the cross, from whose arms hangs a purple drape, expression of the physicality of Christ and his human suffering.