This sacred image was found in 1836, when a monumental altar that, for centuries, has hidden and protected it, was removed. It was painted by "Maestro G.Z.", an anonymous person with a great technical experience. The image, of great emotional outlet, is well suited to the message of comfort that the Brotherhood wanted to convey to the people sentenced to death.

The story begins with the first episode that refers to the death of Adam, made by Giovan Francesco Surchi known as Delai. On the foreground is represented Adam died and the birth of the great green oak (from which the cross of Jesus will be built), on the background we find Seth with the Archangel Michael who gives him the Adam's tree twig of the Paradise Earth, with animals such as deer and horses living in harmony with those fierce.

In the second painting, also made by Delai, two episodes are represented: the Queen of Sheba, that adores the tree of the cross and in the background the Adam tree felling for the construction of Solomon's Temple. The legend tells that the tree was found by Solomon and that he demanded to use it for the construction of his temple, but as the workers were unable to cut the large trunk, they threw it in the lake producing a bridge. When the queen of Sheba came to Solomon, she had the premonition of the crucifixion of Christ on that wood. She kneels to prey for him.

In the third painting by Nicolò Roselli, on the foreground is shown the meeting of Solomon and the Queen of Sheba, during which the Commission communicates its prophetic visions and the subsequent burial of the fatal wood in the lake which then forms the "miraculous pool". On the background the trunk which was to serve the construction of Solomon's temple is now ready to be transformed into the cross of the martyrdom of Christ.

The fourth painting, by Camillo Filippi, represents the Emperor Constantine who is adoring the cross, the symbol of his victory. It is said that Constantine, full of anguish faced the battle and before he looked up to heaven and appeared a flaming cross surrounded by angels who said: "In Hoc Signo Vinces (with this sign you will win)". On the background, Maxentius saw Constantine that was going to cross the river. He forgot that he had cut the supports of the bridge and rushed to the attack, but the trap set by the opponent made him fall into the river with his army. Constantine became sole emperor. With the representation of this episode the cross, besides being the most important empire emblem of the world, it is the whole of humanity.

There are many doubts about the episode represented: this may represent the Golden Legend of the episode in which the Emperor Heraclius brought back to Jerusalem the sacred relic of the cross or may be the "Imitation of Christ" by Thomas de Kempis, a widely used text in the sixteenth century, or even be inspired by the sacred representations of the holy week. The scene has a diagonal articulation that enhances the space in depth: the crosses emerge above the tangle of half-naked bodies and fatigued by their weight, while above a chorus of angels stresses emphatically the triumphant tone of the scene.