He commented the Rhetoric of Tully, and made the good and useful book called the Tesoro , and the Tesoretto , and the Keys of the Tesoro , and many other books of philosophy, and of vices and of virtues, and he was Secretary of our Commune, He was a worldly man, but we have made mention of him because he was the first master in refining the Florentines, and in teaching them how to speak correctly, and how to guide and govern our Republic on political principles.” Boccaccio, Comento , speaks of him thus:⁠— “This Ser Brunetto Latini was a Florentine, and a very able man in some of the liberal arts, and in philosophy; but his principal calling was that of Notary; and he held himself and his calling in such great esteem, that, having made a mistake in a contract drawn up by him, and having been in consequence accused of fraud, he preferred to be condemned for it rather than to confess that he had made a mistake; and afterwards he quitted Florence in disdain, and leaving in memory of himself a book composed by him, called the Tesoretto , he went to Paris and lived there a long time, and composed a book there which is in French, and in which he treats of many matters regarding the liberal arts, and moral and natural philosophy, and metaphysics, which he called the Tesoro ; and finally, I believe, he died