There is no need to dwell in detail on the internal difficulties of Florence during the first half of the fourteenth century. Two main circumstances, however, require to be briefly noticed. These are (i) the contest of the Blacks and Whites, so famous through the part played in it by Dante; and (ii) the tyranny of the Duke[1] of Athens, Walter de Brienne. The feuds of the Blacks and Whites broke up the city into factions, and produced such anarchy that at last it was found necessary to place the republic under the protection of foreign potentates. Charles of Valois was first chosen, and after him the Duke of Athens, who took up his residence in the city. Entrusted with dictatorial authority, he used his power to form a military despotism. Though his reign of violence lasted rather less than a year, it bore important fruits; for the tyrant, seeking to support himself upon the favour of the common people, gave political power to the Lesser Arts at the expense of the Greater, and confused the old State-system by enlarging the democracy. The net result of these events for Florence was, first, that the city became habituated to rancorous party-strife, involving exiles and proscriptions; and, secondly, that it lost its primitive social hierarchy of classes. IV After the Guelfs had conquered the Ghibellines, and the people had absorbed the Grandi in their guilds, the next chapter in the troubled history of Florence was the division of the Popolo against itself. Civil strife now declared itself as a conflict between labour and capital. The members of the Lesser Arts, craftsmen who plied trades subordinate to those of the Greater Arts, rose up against their social and political superiors, demanding a larger share in the government, a more equal distribution of profits, higher wages, and privileges that should place them on an absolute equality with the wealthy merchants. It was in the year 1378 that the proletariate broke out into rebellion. Previous events had prepared the way for this revolt. First of all, the republic had been democratised through the destruction of the Grandi and through the popular policy pursued to gain his own ends by the Duke of Athens. Secondly, society had been shaken to its very foundation by the great plague of 1348. Both Boccaccio and Matteo Villani draw lively pictures of the relaxed morality and loss of order consequent upon this terrible disaster; nor had thirty years sufficed to restore their relative position to grades and ranks confounded by an overwhelming calamity. We may therefore reckon the great plague of 1348 among the causes which produced the anarchy of 1378. Rising in a mass to claim their privileges, the artisans ejected the Signory from the Public Palace, and for awhile Florence was at the mercy of the mob. It is worthy of notice that the Medici, whose name is scarcely known before this epoch, now came for one moment to the front. Salvestro de' Medici was Gonfalonier of Justice at the time when the