In 1857 archaeologists unsealed an ancient house on the Palatine Hill in Rome. Inside, carved into the plaster of one of the walls, they found this inscription.

It appears to show a donkey-headed figure attached to a cross. A young man raises his hand to it, perhaps in worship. Below this is written in crude Greek, “Alexamenos worships [his] God.”

It’s believed to be one of the first representations of the crucifixion of Jesus.