The oil on canvas altarpiece, Madonna with child with Saint John and Saint Dionysius (1617), has been attributed to Baccio Ciarpi. The person on the extreme right without a halo has been identified by some experts as a portrait of St Philip Neri. Others believe the figure to represent Pope Stephen II, who was probably co-founder of the church. The haloed figure standing on the far left wearing a crown and carrying a royal scepter is identified as Saint Louis of Toulouse.