history of Livy, who was by far their favorite historian. The first to read his works—they were four: Boccacio, Benvenuto Rambaldi, Domenico Bandini, and Coluccio Salutati—read them solely for their historical information and their literary style. On the merits of these they were divided. Bandini called him "[a] most eloquent orator and historian", while Salutati commented: For what shall I say about Cornelius Tacitus? Although a very learned man, he wasn't able to equal those closest [to Cicero]. But he was even way behind Livy—whom he proposed to follow—not only in historical series but in imitation of eloquence. The use of Tacitus as a source for political philosophy, however, began in this era, triggered by the Florentine Republic's struggle against the imperial ambitions of Giangaleazzo Visconti. Visconti's death from an illness did more than lift his siege of Florence; it sparked Leonardo Bruni to write his Panegyric to the City of Florence (c. 1403), in which he quoted Tacitus (Histories, 1.1) to buttress his republican theory that monarchy was inimical to virtue, nobility, and (especially) genius. The inspiration was novel—Bruni had probably learned of Tacitus from Salutati. The thesis likewise: Tacitus himself had acknowledged that the good emperors Nerva and Trajan posed no threat to his endeavors. Tacitus, and the theory which Bruni based on him, played a vital role in the spirited debate between the republicans of Florence and the proponents of monarchy and aristocracy elsewhere. Guarino da Verona, in 1435, used the literary flowering of Augustus's era—which included Livy, Horace, Virgil, and Seneca—to argue against Bruni's contention; Gian Francesco Poggio Bracciolini countered with the argument that all the authors had been born during the waning years of the Roman Republic. Pier Candido Decembrio, a Milanese courtier, addressed the same argument to Bruni in the following year, which Bruni did not bother to rebut, the best counterargument having been made already. The rule of Cosimo de Medici, however, saw the end of these political readings of Tacitus, though his works were now readily available in the public library of Florence. Instead, scholars such as Leone Battista Alberti and Flavio Biondo used him in academic works on the history and architecture of 1st century Rome. His laconic style and bleak outlook remained unpopular. At the beginning of the 15th century, following the expulsion of the Medici from Florence, their return, and the foreign invasions of Italy, Tacitus returned to prominence