"Now while the brethren abode in the place aforesaid, the holy man went on a certain Saturday into the city of Assisi, for he was to preach on the Sunday morning in the Cathedral Church. And being thus absent in body from his children, and engaged in devout prayer to God (as was his custom throughout the night), in a certain hut in the canon's garden, about midnight, whilst some of the brethren were asleep and others watching in prayer, a chariot of fire, of marvellous splendour, was seen to enter the door, and thrice to pass hither and thither through the house; ..."

Giotto's was not a nature to find much enjoyment in the portrayal of such events as saints being carried aloft in fiery chariots, and in dealing with this miracle he dedicated all his power to representing the astonishment of the brethren who witness the vision at Rivo-Torto. Two talk together and point to St. Francis being borne across the heavens by crimson horses, one hastens to awaken his companions who are huddled together in their hut like tired dogs asleep, and another starts from his slumbers to hear the wondrous news.

9. Vision of Brother Pacifico.

"This friar being in company with the holy man, entered with him into a certain deserted church, and there, as he was praying fervently he fell into an ecstacy, and amid many thrones in heaven he saw one more glorious than all the rest, adorned with precious stones of most glorious brightness. And marvelling at the surpassing brightness of that throne, he began anxiously to consider within himself who should be found worthy to fill it. Then he heard a voice saying to him: 'This was the throne of one of the fallen angels, and now it is reserved for the humble Francis.'"

With what devotion St. Francis, his hands crossed upon his breast, prays upon the steps of the altar, while the friar behind is intent on asking questions about the marvellous thrones he sees poised above his head. Nothing can exceed the grace of the wide-winged angel floating down to earth to record the humility of Francis, his garments slightly spread by his movement through the air.

10. St. Francis chases the Devils away from Arezzo.

"In order to disperse these seditious powers of the air, he sent as his herald Brother Sylvester, a man simple as a dove, saying to him: 'Go to the gates of the city, and there in the Name of Almighty God command the demons by virtue of holy obedience, that without delay they depart from that place....'"

The main facts of the legend are followed closely in this fresco, but St. Bonaventure does not tell us how the miracle was performed, while Giotto, understanding the soul of Francis, paints him kneeling outside the gates of Arezzo praying with intense fervour for the salvation of the city. His faith is so strong that he does not even look up like Brother Sylvester, to see the demons flee away; some springing from off the chimneys, others circling above the towers, their bat-like wings outspread. The figure of Brother Sylvester is very fine, and the way he is lifting his tunic and stepping forward, as he stretches out one arm with a gesture of command towards the demons, could not be rendered with more ease and truth.

11. St. Francis and Brother Illuminatus before the Sultan of Egypt.

"When they had gone a little further, they met with a band of Saracens, who, quickly falling upon them, like wolves upon a flock of sheep, cruelly seized and bound the servants of God ... having in many ways afflicted and oppressed them, they were ... according to the holy man's desire, brought into the presence of the Sultan. And being questioned by that prince whence and for what purpose they had come ... the servant of Christ, being enlightened from on high, answered him thus: 'If thou and thy people will be converted to Christ I will willingly abide with thee. But if thou art doubtful whether or not to forsake the law of Mohamed for the faith of Christ, command a great fire to be lighted, and I will go into it with thy priests, that it may be known which faith should be held to be the most certain and the most holy.' To whom the Sultan made answer: 'I do not believe that any of my priests would be willing to expose himself to the fire or to endure any manner of torment in defence of his faith.' Then said the holy man: 'If thou wilt promise me for thyself and thy people that thou wilt embrace the worship of Christ if I come forth unharmed, I will enter the fire alone.' ... But the Sultan answered that he dared not accept this challenge, because he feared a sedition of the people."