Bruni's most notable work is
Historiarum Florentini populi libri XII (History of the Florentine People, 12 Books), which has been called the first modern history book. It was Bruni who used the phrase
studia humanitatis, meaning the study of human endeavours, as distinct from those of theology and metaphysics, the source of the term
humanists. As a humanist, Bruni was essential in translating into Latin many works of Greek philosophy and history, such as
Aristotle and
Procopius. Bruni's translations of Aristotle's
Politics and
Nicomachean Ethics, as well as the pseudo-Aristotelean
Economics, were widely distributed in manuscript and in print. His use of
Aelius Aristides'
Panathenicus (Panegyric to Athens) to buttress his republican theses in the
Panegyric to the City of Florence () was instrumental in bringing the Greek historian to the attention of Renaissance political philosophers (see
Hans Baron's
The Crisis of the Early Italian Renaissance for details). He also wrote a short treatise in Greek on the Florentine constitution. Bruni was one of the first Humanists to confront Plato's discussion of same-sex relationships. Bruni died in Florence in 1444, and is buried in a wall tomb by
Bernardo Rossellino in the
Basilica of Santa Croce, Florence. ==Works==