In one of these scenes the saint is found preaching to what must be the most attentive birds on record.

The figures on the ceiling represent Poverty, Chastity, and Obedience, which all Franciscans are pledged to observe.

The glass is coeval with the building, which has been described as the most perfect Gothic chapel in existence.
The founder of this chapel was Ridolfo de' Bardi, whose family early in the fourteenth century bade fair to become as powerful as the Medici, and by the same means, their business being banking and money-lending, in association with the founders of the adjoining chapel, the Peruzzi.

Ridolfo's father died in 1310, and his son, who had become a Franciscan, in 1327; and the chapel was built, and Giotto probably painted the frescoes, soon after the father's death.

Both the Bardi and Peruzzi were brought low by our King Edward III, who borrowed from them money with which to fight the French, at Crecy and Poitiers, and omitted to repay it.
The chapels in the left transept are less interesting, except perhaps to students of painting in its early days.