This baptistery is also one of the oldest buildings in the city. It was likely constructed on the remains of a Roman bathhouse and is named after the bishop who commissioned its construction—Neon.

One of the most striking features of this baptistery is the sharp contrast of colors in its stunning ceiling mosaic, which depicts Jesus (shown here with a beard, unlike in other mosaics) being baptized in the Jordan River by John the Baptist. Surrounding them are two processions of saints and apostles, moving in opposite directions and eventually meeting.

The plants depicted in the mosaic are characteristic of early Christian art.