This is the side panel of a polyptych constituting the « Altar of the Apostles » executed, no doubt, for the San Domenico Church in Siena.  Two other panels are kept at the Nelson-Atkins Gallery of Art in Kansas City (Saint Pierre - Saint Peter) and at the Petit Palais museum in Avignon (Saint Jean l’Évangéliste - Saint John the Evangelist).  The central panel could be a Virgin and Child (Rome, Corsini Gallery).  Saint Paul presents the epistles and his sword of martyrdom.  Heads of saints, dating from framing in the 19th century, are placed as they should appear on the altarpiece.  Léonard Corentin-Guyho, who bequeathed the work, was a magistrate, Quimperlé deputy and art lover.