Similar to the palm tree, which symbolizes Saint Baudilus, it is not unlikely that this central column was designed by an architect to represent a palm tree, attribute of the Saint. Atop the pillar, in between the sprouting arches, is a small cavity, which is believed to be a place where treasures of the church or relics of its saint were once secured. The interior of this space is ribbed in Moorish style, with crisscrossing arches around a domed top, similar to the vaulted dome of the nearby hermitage of .