The sixth chapel on the right is dedicated to St Peter of Alcántara, a rather fierce 16th century Spanish reformer of the Franciscan order, he forbade his followers to wear any sort of footwear or to own libraries, but was a famous spiritual director and was a friend of St Teresa of Avila. The altarpiece sculpture, in an apse lit by windows, is by Michele Maille and shows the St Peter in Ecstasy.