Dei's most significant work was his chronicle of Florentine art, culture, and money, The Chronicle of the Years 1400 to 1500. The book is an exhaustive classification of virtually everyone of note in the city at the time, and remains a key resource for research in Florentine history. He was also a significant member of several intellectual circles, and a number of his letters to and from prominent figures in Florence and throughout northern Italy survive.
Dei also travelled extensively, drumming up trade for the Florentine mercantile houses. Besides business trips to England, Germany, and France, Dei spent time in the Middle East and Africa; he writes in his chronicle and in letters of visits to Beirut, Jerusalem, Carthage, Sfax, Oran, and Timbuktu, among others.
- Dei, Benedetto. La cronica dall’anno 1400 all’anno 1500. Ed. Roberto Barducci; preface by Anthony Molho. Florence: F. Papafava, 1985.