Sixtus IV supported a plot to assassinate a leader of this city and his brother during High Mass in 1478.
This non-Greek city was briefly ruled by the Duke of Athens, Walter of Brienne. "Mud angels" in this city saved art damaged by a 1966 flood. This city's rulers sent agents to stir up rebellion in Gregory XI's Papal States to incite the War of the Eight Saints. Michele  (mee-KEH-lay)  di Lando was installed as gonfaloniere  of justice and greater power was given to the lower guilds during a brief period of democratic rule in this city that followed a (*)  revolt of wool workers. Sixtus IV supported a plot to assassinate a leader of this city and his brother during High Mass in 1478. That Pazzi Conspiracy sought to end the rule of a family who came to power in this city after the fall of the Albizzi and Strozzi families. For 10 points, name this Italian city once ruled by the Medicis.
This non-Greek city was briefly ruled by the Duke of Athens, Walter of Brienne. "
Florence  [or  Firenze ]