I. In the web next to the left wall of the Baptistery is illustrated the first truth of faith contained in the Creed: “CREDO IN DEUM, PATREM OMNIPOTENTEM, CREATOREM CAELI ET TERRAE” (“I believe in God, the Father Almighty, creator of heaven and earth”), testified by the image of the Eternal with His right hand raised heavenwards. In all probability, His left hand, now lost due to deterioration of the fresco, pointed towards the earth. God, immersed in a sphere of light which is emblematic of the world, is thus represented as the creator of all heavenly and earthly things; therefore He shows us with one hand the empyrean and the other the earth, in accordance with a type that recurs insistently in the Sienese cycles illustrating the Creed.

II. The scene next to the back wall, as indicated in the scroll presented by the apostle Andrew, illustrates the second Article of faith: “ET IN IESUM CHRISTUM, FILIUM EIUS UNICUM, DOMINUM NOSTRUM” (“And in Jesus Christ, his only Son, our Lord”). Thus this is the beginning of the illustration of the Creed concerning Jesus Christ, whose figure is rendered in a perfectly frontal position, wrapped in a cloak that opens to reveal the wound in His side.

III. The third web, as the words in the scroll displayed by James the Greater indicate, “QUI CONCEPTUS EST DE SPIRITU SANCTO, NATUS EX MARIA VIRGINE” (“Who was conceived by . . .