Florence had undergone a revolution in May 1527, in which it had
expelled its Medici rulers, nephews of the Pope Clement VII, and
re-established a republican government. However, in the treaty that
concluded the War of the League of Cognac in June, Charles V
pledged to restore and uphold the Medici rule in the city. The
family encountered popular opposition to their restoration, and it
was only in August 1530, after a siege of ten months, that Florence
was restored to the Medici.
Citation:
Editors. "Florence is restored to the Medicis by imperial troops".
The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14448, accessed 25 May 2013.]