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.