The Battle of Anghiari (Leonardo da Vinci)
In 1504 Leonardo da Vinci was given the commission by gonfaloniere Piero Soderini, a contract signed by Niccolò Machiavelli, to decorate the Hall of Five Hundred. At the same time his rival Michelangelo, who had just finished his "David", was designated the opposite wall. This was the only time that Leonardo da Vinci and Michelangelo worked together on the same project. The painting of Michelangelo depicted an episode from the Battle of Cascina, when a group of bathing soldiers was surprised by the enemy. However Michelangelo did not stay in Florence long enough to complete the project. He was able to finish his cartoon, but only began the painting. He was invited back to Rome in 1505 by the newly appointed Pope Julius II and was commissioned to build the Pope's tomb.
David (Donatello)
Donatello, then in his early twenties, was commissioned to carve a statue of David in 1408, to top one of the buttresses of Florence Cathedral, though it was never placed there. Nanni di Banco was commissioned to carve a marble statue of Isaiah, at the same scale, in the same year. One of the statues was lifted into place in 1409, but was found to be too small to be easily visible from the ground and was taken down; both statues then languished in the workshop of the "opera" for several years. In 1416, the Signoria of Florence commanded that the "David" be sent to their Palazzo della Signoria; evidently the young David was seen as an effective political symbol, as well as a religious hero. Donatello was asked to make some adjustments to the statue (perhaps to make him look less like a prophet), and a pedestal with an inscription was made for it: PRO PATRIA FORTITER DIMICANTIBUS ETIAM ADVERSUS TERRIBILISSIMOS HOSTES DII PRAESTANT AUXILIUM ("To those who fight bravely for the fatherland the gods lend aid even against the most terrible foes").