He compiled, chiefly from Livy, a brief sketch of the history of Rome from the foundation of the city to the closing of the temple of Janus by Augustus (25 BC). The work, which is called Epitome de T. Livio Beliorism omnium annorum DCC Libri duo, is written in a bombastic and rhetorical style, and is rather a panegyric of the greatness of Rome, whose life is divided into the four periods of infancy, youth, manhood and old age. It is often wrong in geographical and chronological details; but, in spite of its faults, the book was much used in the middle ages.
In the manuscripts the writer is variously given as Julius Florus, Lucius Anneus Florus, or simply Annaeus Florus. From certain similarities of style he has been identified with Publius Annius Florus, poet, rhetorician and friend of Hadrian, author of a dialogue on the question whether Virgil was an orator or poet, of which the introduction has been preserved.
The best editions are by Otto Jahn (1852), C HaIm (1854), which contain the fragments of the Virgilian dialogue. There is an English translation in Bohn’s Classical Library.
He was considered one of the foremost authorities on theologioal questions among the clergy of the Frankish kingdom; and, in consequence, his opinion was often sought in important ecclesiastical rnatters.
Other canonical writings of Florus are his "Capitula ex lege et canone collecta" and his treatise on the election of bishops, "De electionibus episcoporum".
Another of his works, "Querela de divisione Imperii" a lament over the dissensions of the realm, was written by Florus when the kingdom was undergoing severe political disturbance occasioned by the strife between Louis the Pious and Lothair.