What makes the literary labors of these historians doubly interesting is that they were carried on for the most part independently; for though they lived at the same time, and in some cases held familiar conversation with each other, they gave expression to different shades of political opinion, and their histories remained in manuscript till some time after their death.[2] The student of the Renaissance has, therefore the advantage of comparing and confronting a whole band of independent witnesses to the same events.
Beside their own deliberate criticism of the drama in which all played some part as actors or spectators, we can use the not less important testimony they afford unconsciously, according to the bias of private or political interest by which they are severally swayed.
[1] The dates of these historians are as follows:-- BORN.

DIED.
Machiavelli 1469 1527 Nardi 1476 1556 Guicciardini 1482 1540 Nerli 1485 1536 Giannotti 1492 1572 Varchi 1502 1565 Segni 1504 1558 Pitti 1519 1589 [2] Varchi, it is true, had Nardi's _History of Florence_ and Guicciardini's _History of Italy_ before him while he was compiling his _History of Florence_.

But Segni and Nerli were given for the first time to the press in the last century; Pitti in 1842, and Guicciardini's _History of Florence_ in 1859.
The Storia Fiorentina of Varchi extends from the year 1527 to the year 1538; that of Segni from 1527 to 1555; that of Nardi from 1494 to 1552; that of Pitti from 1494 to 1529; that of Nerli from 1494 to 1537; that of Guicciardini from 1420 to 1509.

The prefatory chapters, which in most cases introduce the special subject of each history, contain a series of retrospective surveys over the whole history of Florence extremely valuable for the detailed information they contain, as well as for the critical judgments of men whose acumen had been sharpened to the utmost by their practical participation in politics.

It will not, perhaps, be superfluous to indicate the different parts played by these historians in the events of their own time.