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.
Giacomo del Duca
Giacomo Del Duca (c. 1520 – 1604) was an Italian sculptor and architect during the late-Renaissance or Mannerist period. He is most remembered for assisting Michelangelo in a number of projects in Rome, including the sculpture and construction of the tomb of Pope Julius II, completed in a highly truncated state relative to the original design, in San Pietro in Vincoli. He also modified Michelangelo's plans for buildings in the Capitoline Hill, one of the most famous and highest of the seven hills of Rome.