Beneath the altar of the fifth-century C.E. church is a piece of bedrock that was mentioned by the fourth-century Christian pilgrim Egeria as the place where Jesus placed the bread and fish before the blessing. In 1936 an earlier, smaller chapel was found beneath the fifth-century church.
The detail shows the loaves in a basket and two fish alongside the basket. The mosaic was excavated in 1932 by A.E. Mader and A.M. Schneider on behalf of the Goerresgesellschaft.