Abstract
Brunetto Latini (1210–1295), Dante Alighieri's teacher, and a Florentine notary, was a very active statesman of the Guelph party. After the defeat of the Guelphs in 1260 at Monteaperti, being exiled, he lived in Picardy, in the wealthy town of Arras, where he wrote his celebrated and justly popular encyclopaedia, Li tresors, on the nature and origin of all things.