Leonardo Brum, called Aretino, an Italian author, born in Arezzo in 1369, died in Florence, March 9, 1444. For about ten years he was secretary of the papal chancery, excepting in 1410, when he was for a short time chancellor of the Florentine republic. His career at the Vatican was terminated by his marriage in 1412, and three years later he went to Florence, where he again became chancellor. Here he completed his Latin Historia Florentina (Italian translation, Venice, 1473). He retained the chancellorship for 17 years, and was foremost among the celebrated scholars who met in the palace of Cosmo de' Medici. His Italian writings marked a new era in the increased polish of the language, and his Latin translations of Greek authors contributed greatly to the revival of classical learning. His history of the Goths, De Bello Italico adversus GotJios (Foligno and Venice, 1470-71), is regarded as his best work. It was reprinted with Pro-copius, from whom it is chiefly taken, and with other histories of Gothic wars (Basel, 1531; Paris, 1534). His Upistolm Familiares (most complete edition, by the abbe Melius, Florence, 1731, with Bruni's biography and a full catalogue of his works) give valuable information respecting the literature of the 15th century.

He wrote biographies in Italian of Dante and Petrarch, and of Cicero in Latin and Italian. His novel, De Amore Guistardi et Sigismundae Filice Tancredi, taken from Bocca-cio's Decameron, has been translated into English in "William Walter's "Amorous History of Guystarde and Sigismonde, and of thyr dolorous Deth " (London, 1532).