to punish the rebellious citizens.

On the latter occasion he revenged himself for the insults offered him in 1527 by the cruelty with which he pushed proscription to the utmost limits, relegating his enemies to unhealthy places of exile, burdening them with intolerable fines, and using all the indirect means which his ingenuity could devise for forcing them into outlawry and contumacy.[3] Therefore when he returned to inhabit Florence, he did so as the creature of the Medici, sworn to maintain the bastard Alessandro in his power.

He was elected a member of the Senate of eighty; and so thoroughly did he espouse the cause of his new master, that he had the face to undertake the Duke's defense before Charles V.at Naples in 1535.

On this occasion Alessandro, who had rendered himself unbearable by his despotic habits, and in particular by the insults which he offered to women of all ranks and conditions in Florence, was arraigned by the exiles before the bar of Caesar.

Guicciardini won the cause of his client, and restored Alessandro with an Imperial confirmation of his despotism to Florence.
This period of his political career deserves particular attention, since it displays a glaring contradiction between some of his unpublished compositions and his actions, and confirms the accusations of his enemies.[4] That he should have preferred a government of Ottimati, or wealthy nobles, to a more popular constitution, and that he should have adhered with fidelity to the Medicean faction in Florence, is no ground for censure.[5] But when we find him in private unmasking the artifices of the despots by the most relentless use of frigid criticism, and advocating a mixed government upon the type of the Venetian Constitution, we are constrained to admit with Varchi and Pitti that his support of Alessandro was prompted less by loyalty than by a desire to gratify his own ambition and avarice under the protective shadow of the Medicean tyranny.[6] He belonged in fact to those selfish citizens whom Pitti denounces, diplomatists and men of the world, whose thirst for power induced them to play into the hands of the Medici, wishing to suck the state[7] themselves, and to hold the prince in the leading-strings of vice and pleasure for their own advantage.[8] After the murder of Alessandro, it was principally through Guicciardini's influence that Cosimo was placed at the head of the Florentine Republic with the title of Duke.