The dating coincides with the rule of Roman emperor Constantine, who ended the persecutions of Christians.
Representing the earliest depiction of Jesus found in Spain, the glass plate features greenish hues and is in an excellent state of preservation. Archaeologists managed to piece together 81 percent of its original area.
Early Image of Jesus Found in Egyptian Tomb
According to Castro, the plate is in line with the Christ in Majesty iconography. Copying Roman and Byzantine styles, the early Christian artists always portrayed Jesus in the center of the composition, often flanked by other sacred characters.
In the glass paten, Jesus holds the Cross in one hand - a symbol of the resurrection - and the Holy Scriptures in the other. Both the figures on his sides, possibly the apostles Peter and Paul, carry a roll in their hands.
"The scene takes place in the celestial orb, framed between two palm trees, which in Christian iconography represent immortality, the afterlife and heaven, among other things," the archaeologists wrote in a statement.